Presentation
Dermatofibromas are hard solitary slow-growing papules (rounded bumps) that may appear in a variety of colours, usually brownish to tan. In addition, they are often elevated or pedunculated. Although typical dermatofibromas cause little or no discomfort, itching and tenderness can occur. Some physicians and researchers believe dermatofibromas form as a reaction to previous injuries such as insect bites or thorn pricks. They are composed of disordered collagen laid down by fibroblasts. In rare cases, basal cell carcinoma may develop in a dermatofibroma.
They are usually found on the leg.
Deep penetrating dermatofibroma may be difficult to distinguish, even histologically, from rare malignant fibrohistocytic tumours like dermatofibrosarcoma protuberans.
Dermatofibromas occur most often in women; the male to female ratio is about 1:4. The age group in which the nodule occurs is twenty to forty-five years.
Read more about this topic: Benign Fibrous Histiocytoma
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