Cause: This disease is a congenital verrucous hyperplasia of the epidermis that occurs since childhood. Clinical symptoms: More common in children, the incidence is equal in both sexes, and can occur in any part of the body. In most cases, it is a wart-like growth, which is brown or black. Papilloma-like small spines, irregular bulges, and the surface is greasy to touch. They may be long or short in the shape of strips, and the strips run very irregularly. No symptoms, just unsightly. Prevention and treatment: Laser treatment can be performed under local anesthesia. There will be a slight mark after the operation, but it is basically normal skin.

Identification points: Verrucous nevus often occurs on one side, arranged in a linear shape, hard in texture, clean on the damaged surface, and not easy to bleed. In addition to some special parts, the same rash often occurs in other places. The medical history is longer and the efficacy of topical drugs is poor.

Pathological changes show varying degrees of epidermal hyperplasia, mainly hyperkeratosis, papilloma-like hyperplasia and acanthosis, increased melanin in the basal layer, and no vacuolated cells of condyloma acuminata, making pathological identification easier