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multiple smooth dome-shaped papules nodules scrotum scrotal skin
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multiple pedunculated smooth papules nodules scrotum scrotal skin diagnosis differential
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GradeResponse
The image and database match are highly concordant. Here is the diagnosis and clinical summary:
Diagnosis: Steatocystoma Multiplex (SM)
What It Is
Steatocystoma multiplex is a benign hamartomatous condition of the pilosebaceous unit, characterized by numerous sebaceous duct cysts. It is caused by mutations in the KRT17 gene (keratin 17), which can be inherited in an autosomal dominant pattern or occur sporadically.
Classic Features (matching this image)
| Feature | This Case |
|---|---|
| Multiple smooth dome-shaped papules/nodules | ✅ |
| Skin-colored to yellow-tan hue | ✅ |
| Size range 2–10 mm | ✅ |
| Distributed over scrotum | ✅ |
| Asymptomatic | Typical |
| Rubbery, compressible consistency | Typical |
On puncture, these cysts exude an odorless, oily/creamy fluid — pathognomonic.
Common Sites
- Scrotum (very common in males)
- Chest, axillae, face, upper arms
- Rarely generalized
Histology
- Cyst wall lined by stratified squamous epithelium with sebaceous lobules attached
- Characteristic eosinophilic cuticle on inner lining (no granular layer)
Differential Diagnosis
| Condition | Distinguishing Features |
|---|---|
| Epidermoid cysts | Single or few; contain keratin/cheesy material; granular layer present on histology |
| Molluscum contagiosum | Umbilicated; infectious; different population |
| Fordyce spots | Flat, tiny, yellow; ectopic sebaceous glands |
| Angiokeratoma of scrotum | Dark red/purple; vascular; older patients |
| HPV condylomata | Verrucous surface; STI context |
Management
SM is benign and treatment is elective (cosmetic or symptomatic):
- Incision & drainage / excision — most definitive
- Radiofrequency ablation / CO₂ laser — good cosmetic outcome, especially for scrotal lesions
- Retinoids (oral isotretinoin) — may reduce new cyst formation, doesn't resolve existing cysts
- No treatment required if asymptomatic
Key Point
The clinical picture here — numerous smooth, round, dome-shaped, tan/skin-colored cysts scattered over the scrotum in a young male — is essentially diagnostic of steatocystoma multiplex. Biopsy confirms if uncertain.
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