Variants and atypical appearances

While the classic bullseye pattern is the most common presentation, dermatofibromas can look different depending on their age, composition, and location.

Total white network pattern

Some dermatofibromas show a total white network — white lines forming a mesh or lattice pattern across the entire lesion, rather than a single central white patch. This occurs when the fibrosis is distributed more evenly throughout the lesion rather than concentrated in a dense central core.

This variant can be less immediately recognisable, but the key feature is the same: prominent white structural elements that are not seen in melanocytic lesions.

Ring-like or concentric pattern

Some dermatofibromas display subtle ring-like structures — concentric zones of alternating colour creating a bullseye or target appearance. These correspond to the layered architecture of the lesion: central fibrosis, surrounding reactive epidermis, and normal skin beyond.

Pigmented dermatofibroma

Occasionally, a dermatofibroma shows more prominent pigmentation — darker brown network or even focal areas of deeper pigment. The central white patch is usually still present but may be less conspicuous against the surrounding pigment. These variants can raise concern for a melanocytic lesion.

Haemosiderotic dermatofibroma

Rarely, dermatofibromas contain haemosiderin deposits from old haemorrhage, giving them a brown, blue, or even dark appearance. These can be challenging to distinguish from melanocytic lesions. If the classic pattern is not clearly visible, further evaluation is warranted.