Cutaneous horn with underlying squamous cell carcinoma complicating discoid lupus erythematosus of scalp: A hitherto unreported complication

Abstract Cutaneous horn, characterized by conical protrusion arising from the skin surface, comprises of hyperkeratotic epidermis. It is commonly seen on photo-exposed body parts in elderly men and can arise from benign, premalignant, or malignant dermatoses. There are scarce reports of cutaneous horn developing in association with discoid lupus erythematosus (DLE). We report an interesting case of cutaneous horn with underlying well-differentiated squamous cell carcinoma arising over chronic scarred lesion of DLE on the scalp.