Hong Kong Med J 2016 Jun;22(3):263–9 | Epub 6 May 2016
DOI: 10.12809/hkmj154645
Common urological problems in children: prepuce, phimosis, and buried penis
Ivy HY Chan, FRCSEd(Paed), FHKAM (Surgery); Kenneth KY Wong, PhD, FHKAM (Surgery)
Division of Paediatric Surgery, Department of Surgery, The University of Hong Kong, Queen Mary Hospital, Hong Kong
Corresponding author: Dr Kenneth KY Wong (kkywong@hku.hk)
 Full paper in PDF
Parents often bring their children to the family doctor because of urological problems. Many general practitioners have received little training in this specialty. In this review, we aimed to provide a concise and informative review of common urological problems in children. This review will focus on the prepuce.
Young boys are often brought by parents to see a medical practitioner for ‘phimosis’, and circumcision is one of the most commonly performed operations. Yet this topic is often not taught routinely in medical school. Buried penis is another less well-defined condition. In this review article, we will describe these conditions in a more systematic manner and present the current available knowledge about the conditions and management options.
Normal development of the prepuce and phimosis
Phimosis generally refers to a condition where the prepuce cannot be withdrawn to expose the glans. True phimosis, however, should be defined as a pathological condition in which the prepuce is scarred, non-retractile, and with a narrow preputial ring. This is secondary to balanitis xerotica obliterans (BXO). To avoid confusion of the terms, ‘physiological phimosis’ and ‘pathological phimosis’ should be used.
Physiological phimosis
Physiological phimosis is a natural condition in which the prepuce cannot be retracted and there is natural adhesion between the glans and the prepuce (Fig 1). Almost all normal male babies are born with a non-retractable foreskin. Indeed, Gairdner1 noticed only 4% of newborns in England and Wales had retractable foreskin. The foreskin becomes retractable as the child grows. The adhesion between the prepuce and glans will also separate gradually as a spontaneous biological process.2 3 4 By the age of 3 years, 90% of prepuces are retractable.1 Øster2 examined preputial development in 173 Danish boys aged 6 to 17 years annually for 7 years and determined that the foreskin was non-retractable in 8% of young boys but in only 1% at 17 years of age. Similar findings were noted in Chinese boys by Ko et al5 and Hsieh et al,6 who reported 84.1%5 and 58.1%6 of boys with a completely retractable prepuce by the age of 13 years. Both the retractability and the shape of the prepuce lie within a spectrum that can sometimes be difficult to describe and there is no agreed classification system. Different papers have used their own classifications for the purpose of study. One example was the study by Kayaba et al3 in which retractability was graded according to how much of the glans was visible after prepuce retraction.

Figure 1. Physiological phimosis
Pathological phimosis/balanitis xerotica obliterans
Balanitis xerotica obliterans is a chronic and progressive inflammatory condition that affects the prepuce, glans, and sometimes the urethra (Fig 2). It was first described in 1928 by Stühmer.7 There are three components of this condition: ‘balanitis’, meaning chronic inflammation of the glans penis; ‘xerotica’, an abnormally dry appearance of the lesion; and ‘obliterans’, for the association of occasional endarteritis.

Figure 2. Scarred preputial opening in a patient with balanitis xerotica obliterans
The aetiology and the true incidence is unknown. An incidence of 0.6% has been reported for boys affected by their 15th birthday.8 It is suspected clinically when there is a ring of hardened tissue with a whitish colour at the tip of the foreskin. There are also other clinical features such as white patches over the glans, perimeatal sclerotic changes, or meatal stenosis. It can cause urethral stricture and retention of urine.
Medical students are not taught about the condition and it is generally not diagnosed at the primary care level. Gargollo et al9 reviewed 41 patients with the pathologically confirmed diagnosis of BXO at their centre and confirmed that no patient had the diagnosis at referral. Pathology of the excised prepuce showed lymphocytic infiltration in the ripper dermis, hyalinosis and homogenisation of collagen, basal cell vacuolation, atrophy of the stratum malpighii, and hyperkeratosis.
Potential clinical problems
Parents often seek medical advice about their son’s ‘foreskin problems’. Pain, redness, itchiness, long prepuce, ballooning during urination, difficulty in retracting the prepuce, and penis being too short are the common complaints. Before answering all the questions, we should be able to differentiate the normal and abnormal.
Pain, pruritus, smegma
Most parents may think that the presence of pain or pruritus indicates infection of the prepuce, and yet poor prepuce hygiene is a more common problem. Smegma is another common complaint from parents, usually described as a ‘mass’, or ‘white pearl’. Smegma can be identified by gently retracting the prepuce (Fig 3). It is harmless and is a combination of secretions and desquamated skin.

Figure 3. Smegma seen after retracting the prepuce during circumcision
Difficulty in retracting the prepuce and long prepuce
Difficulty in retracting the prepuce and long prepuce is a feature of physiological phimosis. This is normal in most boys and requires no attention apart from daily routine prepuce hygiene. The role of the physician is to differentiate normal and abnormal prepuce, then guide proper management.
Ballooning is a feature of a tight prepuce. Because of the tight preputial opening, there is dilatation of the preputial sac during voiding. This causes a lot of parental anxiety about possible urinary outflow obstruction. Babu et al10 performed uroflow studies in boys with and without ballooning of the foreskin and determined that there was significant difference.
This refers to inflammation of the glans (balanitis) and the foreskin (posthitis) [Fig 4]. Patients present with a swollen prepuce with or without discharge from the preputial opening. It is a relatively common condition, with a reported incidence of 6% in uncircumcised boys.11 In the absence of fever, underlying urinary tract infection (UTI) is unlikely. Simple bathing and rinsing with normal saline or chlorhexidine gluconate solution after urination is sufficient treatment for afebrile patients. Topical antibiotic cream is commonly prescribed for local infection. Serious conditions and presence of fever may warrant further investigations, oral antibiotics, or even hospital admission.

Figure 4. Balanoposthitis
Clinical management of phimosis
Prepuce hygiene and retraction
After diagnosing physiological phimosis, parents should be taught how to keep the prepuce clean. Only a small proportion of parents know what is required.12 Gentle daily retraction of the prepuce and rinsing of the prepuce with warm water can maintain good hygiene and prevent infection. Parents should also be taught to avoid forcible retraction of the prepuce.13 14 15 Simple stretching of the prepuce alone has been shown to be effective in achieving complete resolution of physiological phimosis.16 After 3 months of prepuce stretching, 76% of patients reported resolution of phimosis.16
Topical steroids
Topical steroids have been prescribed in the treatment of phimosis. Their anti-inflammatory, immunosuppressive, and skin-thinning properties are believed to be the mechanism for resolution of phimosis.17 Their use in physiological phimosis was first described by Kikiros et al.18 Subsequent studies showed the response rate for resolution of phimosis to be 68.2% to 95%.16 19 20 21 22 Moreno et al23 subsequently performed a meta-analysis and reviewed 12 randomised controlled trials on the use of different topical steroid formulations, and again confirmed the significant benefit of corticosteroids in the complete or partial clinical resolution of phimosis (risk ratio=2.45; 95% confidence interval, 1.84-3.26).
Parents often ask about the potential complications of topical steroid use. Golubovic et al24 and Pileggi et al25 addressed this issue by measuring serum cortisol levels and salivary cortisol levels, respectively. Neither could demonstrate a significant change in cortisol level after application of topical steroids. Topical steroid therapy is thus a safe and effective alternative to circumcision.
Circumcision is a procedure in which part of the foreskin is removed and results in a non-covered glans. It is a procedure that has been described for many years and is performed almost universally in Jewish and Muslim boys. The rate of newborn circumcision is high in the US (>50%),26 27 but routine circumcision is not a tradition in the Chinese population. Leung et al28 showed the circumcision rate in 6- to 12-year-old boys in Hong Kong to be 10.7%.
Benefits versus risks of circumcision
There is evidence that circumcision can reduce the risk of UTI, penile cancer, human immunodeficiency virus (HIV), and sexually transmitted disease (STD).
Urinary tract infection
Childhood UTI is associated with renal scarring. The symptoms and signs of UTI are often non-specific in young children who may present with fever alone. The overall prevalence of UTI in children with fever (<19 years old) was reported to be 7.8% in a meta-analysis published in 2008.29 The pooled prevalence of febrile UTI in male infants from 0 to 24 months of age was 8.0% (confidence interval, 5.5-10.4%). Circumcised boys had a lower risk of developing UTI—20.1% in uncircumcised versus 2.4% in circumcised infants of less than 3 months of age with fever.29
Another systematic review in 2005 showed a decreased risk of UTI in circumcised boys.30 The authors calculated the number-needed-to-treat was 111 in normal boys, but the number-needed-to-treat for recurrent UTI and high-grade vesicoureteric reflux was 11 and 4, respectively. It was evident that the benefits of circumcision were higher for boys at risk of UTI.
Sexually transmitted infection and human immunodeficiency virus
Three randomised controlled trials concluded that adult circumcision had a protective effect against acquisition of HIV.31 32 33 Although the full mechanism of protection was not fully understood, it was shown that the inner foreskin harbours epithelial CD4+ CCR5+ cells and has features of an inflamed epidermal barrier. These changes may support a subclinical inflammatory state in uncircumcised men, with availability of target cells for HIV infection, and potentially account for the benefits of circumcision in STD prevention.34 All the trials were performed in Africa, with a much higher prevalence of HIV. Education about use of condoms and safe sex practice was relatively primitive compared with Hong Kong. Readers should therefore interpret these results with caution when discussing the benefits of circumcision on HIV prevention with our patients.
A meta-analysis published in 2006 by Weiss et al35 showed that circumcised males were at a lower risk of syphilis, and there was a lower association with herpes simplex virus (HSV) type 2. Other cohorts also showed similar findings, with circumcised males having a decreased risk of syphilis, gonorrhoea, and human papillomavirus (HPV).36 37 38 39 On the contrary, another systematic review by Van Howe40 showed that most STDs are not impacted significantly by circumcision status. They included chlamydia, gonorrhoea, HSV, and HPV. Despite the positive findings in some studies, it should be remembered that the use of a condom and safe sex are the most important deterrents. The protective effect of circumcision might give a false sense of security and should not be advocated over other preventive measures.
Risks and complications of circumcision
Circumcision is one of the most commonly performed operations in the world and involves excision of a ring of preputial tissue. In general, the procedure may involve the use of a special device (eg Plastibell, Gomco clamp, Mogen clamp, Shang ring) or may apply the ‘free hand excision method’. Depending on the method, suturing may or may not be involved. Every procedure is associated with risks and complications. The rate is different depending on the operator (ritual circumciser or surgeon) and the setting (home, clinic, or hospital).
There has been inadequate comparison of the complication rates of ‘device method’ surgery and the ‘free hand excision method’ so it is difficult for the authors to recommend a single best method for surgical circumcision. The overall complication rate of circumcision varies from 0.5%41 to 8%.42 As the indication for circumcision in some patients is not medical (eg religious or ritual circumcision), the risks should be carefully explained to the patient before the procedure.
Early complications include bleeding, wound infection, and UTI. Bleeding is one of the most common postoperative complications that, in extreme cases, may lead to shock.43 Meticulous technique during the procedure is thus important. If bleeding is encountered postoperatively, it can usually be controlled by local compression or bedside plication.
In a UK study, the infection rate after circumcision has been reported to be around 0.3%.44 It is usually minor and can be treated by simple irrigation with antiseptic solution. Systemic antibiotics are rarely needed. A systematic review of the prevalence and complications of circumcision was performed in eastern and southern Africa.45 The infection rate was very high and two thirds of patients presented with systemic infection requiring antibiotics. The authors believe the quality of local wound care is very important in minimising the infection rate. Urinary retention is uncommon after circumcision but can occur in up to 3.6% of cases. It is likely to be pain-related or due to improper placement of a circumcision device, eg Plastibell.46
Wound dehiscence may occur and can be managed with wound care and dressing. Very rarely, excessive prepuce loss as a result of excessive skin excision may be seen. This potentially disastrous complication has been reported to be treated with a full-thickness skin graft.47
Late complications are not uncommon, reported by one study to be present in 4.7% of newborn circumcisions.48 Redundant residual skin and recurrent penile adhesion are the two most common late complications that may necessitate revision circumcision. Meatal stenosis is another late but uncommon complication after circumcision and requires surgery. The cause is not known but it is more common in patients with BXO.49 50
There are some other less-common but severe complications, including urethrocutaneous fistula, glans amputation, and iatrogenic buried penis.51 52 These have long-term physiological and psychological consequences for both the patient and family. Surgical technique and the surgeon’s awareness of limitations of each method of circumcision is important. Parents should be fully informed before they make a decision about circumcision, especially where the patient is physically weak or where there is no medical indication for the procedure.
Current guidelines on circumcision
Various international colleges have produced guidelines on circumcision. These include the British Association of Paediatric Surgeons,53 the Royal Australasian College of Physicians,54 and the American Academy of Pediatrics.55 56
Having taken all these into account, the overall view of our unit is as follows:
(1) Although there is some scientific evidence for the benefits of circumcision, the routine use on all males is not justified. Parents should be fully informed of all the potential benefits and risks of the procedure.
(2) Our current medical indications for circumcision are:
(a) penile malignancy (though this is extremely rare in children) or traumatic foreskin injury where it cannot be salvaged; and
(b) BXO, severe recurrent attacks of balanoposthitis, and/or recurrent febrile UTIs.
(3) Non-therapeutic ‘ritual’ circumcision may be offered.
Buried penis
Buried penis is a condition where the penis is ‘trapped’ or ‘concealed’ under the suprapubic area. There is an apparent absence or partial absence of the penis. Figure 5 shows partial buried penis in an 8-year-old boy. The condition was described as ‘complete’ or ‘partial’ by Crawford57 in 1977. In the partial type, the proximal half of the penile shaft is buried in the subcutaneous tissue. For the complete type, the phallus is completely invisible and the glans is covered only by prepuce. Maizels et al58 further elaborated in 1986, offering new classifications as ‘buried penis’ (patients with redundant suprapubic fat and/or lack of penile skin anchoring to deep fascia), ‘webbed penis’ (scrotal skin webs the penoscrotal angle to obscure the penis), ‘trapped penis’ (the shaft of the penis is entrapped in the scarred, prepubic skin following trauma/overzealous circumcision), ‘micro-penis’ (a normally formed penis that is less than two standard deviations below the mean size in the stretched length), and ‘diminutive penis’ (a penis that is small and/or malformed as a consequence of epispadias/exstrophy, severe hypospadias, disorder of sexual differentiation, or chromosomal anomalies). O’Brien et al59 described another condition called ‘congenital megaprepuce’ in 1994 that includes a phimotic ring and large preputial sac. Despite these studies, buried penis is still not a well-defined or well-classified entity. It can be congenital or iatrogenic after overzealous circumcision. Clinicians are reminded to examine the penis carefully and the exact penile length should be a properly performed ‘stretched penile length’. When there is uncertainty about the exact diagnosis, early specialist advice is advocated.

Figure 5. (a) A patient with buried penis and apparent short penis, and (b) the same patient after stretching the prepuce. The actual length of penis is concealed by the suprapubic fat in this patient
Clinical problems
For congenital problems, anxious parents usually seek medical advice because they feel that their child’s penis is too short. Other problems include local infection, urinary retention, inability to void standing, chronic urinary dripping, and undirected voiding. For older children, there may be pain during erection or disturbed vaginal penetration.60 61 62
Anatomically, buried penis is usually due to insufficient outer prepuce and lack of attachment between the penile Buck’s fascia and the pubis.63 Numerous corrective surgical techniques have been described. The underlying principle is the degloving of the penis, anchoring of Buck’s fascia to the pubis, and preputioplasty (pedicled preputial flap, Z-plasty of the prepuce, lipectomy, and skin graft) [Fig 6].64 65

Figure 6. Appearance after preputioplasty for buried penis
A study on the comparison of quality of life before and after surgery showed significant improvement in sexual pleasure, urination difficulties, and genital hygiene.66 King et al61 also reported that all patients were happy with the aesthetic results.
It is essential to recognise the features of physiological versus pathological phimosis. Physiological phimosis (tightness of prepuce), preputial adhesion, and smegma are common and normal in young boys, and do not require surgical intervention. There are potential benefits and complications of circumcision that should be thoroughly appreciated by physicians before discussion with parents or patient. Medical indications for circumcision include penile malignancy, traumatic foreskin injury, recurrent attacks of severe balanoposthitis, and recurrent febrile UTIs with abnormal urinary tract. Very few international societies support routine circumcision despite the potential medical benefits incurred. Buried penis is a condition that may warrant surgery.
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