Phimosis - Causes and Reasons

Definition

1. Physiological (Normal / Non-pathological)

• Congenital / developmental - the foreskin is naturally non-retractile at birth in all uncircumcised males. The inner surface of the foreskin is adherent to the glans; this is completely normal.
• Age-related resolution - by age 3, fewer than 10% of foreskins remain non-retractile; by late adolescence, nearly all become retractable.
• This type does NOT require treatment and resolves on its own.
• Tintinalli's Emergency Medicine, p. 635 - Robbins & Kumar Basic Pathology

2. Pathological (Acquired) Causes

a) Infection / Balanoposthitis (Most Common)

• Repeated or chronic inflammation of the glans (balanitis) and foreskin (posthitis) leads to fibrosis and scarring of the prepuce.
• Poor local hygiene is the most frequent underlying trigger.
• Smith and Tanagho's General Urology identifies chronic infection from poor hygiene as the most common cause.

b) Diabetes Mellitus

• In older diabetic men, chronic balanoposthitis is a well-recognized cause of acquired phimosis and may even be the first presenting complaint of undiagnosed diabetes.
• Smith and Tanagho's General Urology

c) Balanitis Xerotica Obliterans (BXO) / Lichen Sclerosus (LS)

• A chronic, progressive, sclerosing dermatosis affecting the glans and prepuce.
• Produces white, depigmented, hardened scarring of the distal prepuce, leading to pathological phimosis.
• Can extend to the urethral meatus, causing urinary obstruction.
• This is the most common cause of pathological phimosis in boys and men.
• Campbell-Walsh-Wein Urology, Dermatology 2-Volume Set, Bailey and Love's Surgery

d) Forcible Retraction

• Premature or forceful retraction of the foreskin (e.g., by parents or during medical examinations) causes micro-tears and subsequent scarring, leading to acquired phimosis.
• Tintinalli's Emergency Medicine

e) Recurrent Trauma / Previous Preputial Injuries

• Any injury to the prepuce with resulting scar tissue formation can lead to stenosis of the preputial opening.
• Tintinalli's Emergency Medicine

f) Post-circumcision Skin Excess

• If excessive foreskin is left after circumcision, the residual skin can become stenotic and cause secondary phimosis.
• Smith and Tanagho's General Urology

g) Graft-versus-Host Disease (GvHD)

• Can produce fissures, erosions, and ulcerations of the genitalia resembling lichen sclerosus, leading to balanitis and phimosis.
• Dermatology 2-Volume Set

Summary Table

Clinical Consequences of Phimosis

• Difficulty with urination or urinary retention (if preputial meatus is nearly sealed)
• Ballooning of foreskin during micturition with post-void dribbling
• Recurrent UTIs
• Risk of paraphimosis (foreskin trapped behind glans after retraction)
• Increased risk of squamous cell carcinoma of the penis
• Calculi under the foreskin