Verrucous
nevus), also known as verrucous epidermal nevus, linear epidermal nevus, verrucous nevus, etc., usually develops at birth or in early childhood, but it may also appear at the age of 10 to 20 years, and can develop in both sexes. They usually appear as yellowish to brownish-black warts. The size, shape and distribution vary, most of them are papillary elevations, arranged in bands or lines or patches, and can occur all over the body, occurring in and around the genitals and anus of both men and women, and are often easily misdiagnosed as warts. The most important point of differentiation is that wart-like moles often occur unilaterally, arranged in lines, hard, the surface of the damage is clean, not easy to bleed. The same rash is often found elsewhere, outside of some specific areas. The history of the disease is long and the efficacy of topical drugs is poor. The pathological changes are of varying degrees of epidermal hyperplasia, mainly hyperkeratosis, papillomatous hyperplasia and hypertrophy of the spinous layer, with increased melanin in the basal layer, without the vacuolated cells of acanthosis, making pathological differentiation easier. The actual fact is that there is no special treatment for this disease, the more effective method is surgical treatment, but also has limitations. 1, warty nevus, also known as linear nevus, is usually arranged in a linear pattern. It occurs on one side of the body. Smaller lesions can be removed surgically. If the lesions are too large, skin implants are needed after excision, and the lesions can be treated with electrocautery, laser and liquid nitrogen freezing. Treatment is better before school age. 2. On both sides of the bridge of the nose, the skin is thin and the subcutaneous fat is also thin, and the veins running under it can appear green and bruised through the skin, but hemangioma should be excluded.