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Articles in skin conditions and diseases: Acne Actinic keratosis Albinism Basal cell nevus syndrome Bathing trunk nevus Birthmarks Cherry angioma Seborrheic keratosis Cutaneous skin tags Dermatitis Ehlers-Danlos syndrome Erythrasma Hives Ingrown toenails Keloid Keratosis pilaris Klippel-Trenaunay syndrome Leprosy Livedo reticularis Moles Mongolian blue spots Psoriasis Polymorphic light eruption Port wine stain Pyogenic granuloma Rosacea Scabies Scleroderma Sebaceous cysts Shingles Skin lesions Skin lesion of histoplasmosis Skin lesion of coccidioidomycosis Skin tags Smallpox Spider angioma Spider veins Superficial thrombophlebitis Tinea versicolor Urticaria pigmentosa Varicose veins Vitiligo Wegener's granulomatosis Xanthelasma and xanthoma

Bathing trunk nevus

A bathing trunk nevus is a congenital (present from before birth), disfiguring, darkly pigmented, often hairy patch of skin (nevus), which may cover an extremely large area of the body. Sometimes the nevus covers most of the trunk, the upper arms, and thighs. Bathing trunk nevi are thought to be caused by spontaneous mutations or other events during fetal

development, but in some families, the frequent appearance of these lesions suggests that they may be genetically inherited. They may be associated with other birth defects. The surface texture may vary from smooth to warty, and the color varies from brown to bluish black. Bathing trunk nevi may cause emotional problems because of their appearance.

Symptoms of a bathing trunk nevus may include: • a brown molelike birthmark covering an extensive area of the trunk or legs • color varying from brown to blue-black • hair growing from the mole • smaller lesions near the large mole • surface texture varying from smooth to warty.

All birthmarks should be evaluated by your health care provider. A biopsy of suspicious areas may be obtained for examination to determine if the cells have become cancerous. An MRI of the brain might be performed. Treatment consists of surgery to remove of the nevus, with skin grafting where necessary. Extremely large nevi may be removed in several stages. Psychological treatment may be needed to deal with the emotional impact of having a disfiguring disorder.

A bathing trunk nevus may develop into melanoma, a particularly serious form of skin cancer. The cosmetic appearance may cause psychosocial problems.

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All information is intended for reference only. Please consult your physician for accurate medical advices and treatment. Copyright 2005,, all rights reserved. Last update: July 18, 2005