Trichodiscoma

What it means

A small benign fibrovascular tumor of the dermal part of the hair disk. Trichodiscoma is rather simple in appearance and consists of a dome-shaped fibrous tumor with a prominent vascular component that fills the papillary dermis under an atrophic epidermis. As in a normal hair disk, a hair follicle may be present at one edge of the papular lesion.

In contrast to trichodiscoma, fibrofolliculoma shows a keratin-plugged and often distorted hair follicle in the center of the lesion. A mantle of mucoid or fibrous stroma surrounds this central follicle; thin epithelial strands emerge from the central follicle and may form a netlike pattern.

Rare diseases that can present with this1

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category