Some pointers taken from the Dermatopathology RCPA Quality Assurance Programme: 1. Glomus tumour : It can occur in other places other than the nailbed. Other variants may be glomangioma, glomangiomyoma and symplastic glomus tumour. Malignant glomus tumour is a rare entity. A differential is spiradenoma. 2, Fixed drug eruption : Composed of a combination of erythema multiforme -like changes, mixed inflammatory infiltrate, and melanophages in the superficial dermis. Here is a nice explanation on the clinical features . 3. Chondrodermatitis nodularis helicis Painful nodule typically in the upper part of ear in older males. 4. Naevus cell rests in lymph nodes. Apparently it is not that uncommon (22% of lymphadenectomies in a large study). 5. Superficial acral fibromyxoma Circumscribed but non encapsulated lesions, typically at fingers and toes. Strongly CD34 positive. Differentials include: 1. Low grade fibromyxoid sarcoma: Deep soft tissue lesion, ...