A 32 year old lady with skin type 3 was referred with a long-standing lesion on the lower leg, which had possibly changed. There was no other relevant history.
Dermoscopy - Introduction, Terminology and Structures
A document to help you understand the dermoscopic descriptions used in this blog.
Dermoscopy Algorithm
To help you work through dermoscopic cases.
Dermoscopically the centre is white with a few white lines (black arrow). At the periphery there are areas of a brown rounded network (blue arrows). The diagnosis is consistent with a dermatofibroma.
Most dermatofibromas have a white centre (unless the lesion is flat). The centre is often fairly structureless but there can be a white network, or sometimes white lines. At the periphery there is often a subtle brown rounded network, which is more obvious in individuals with darker skin types. Some authors refer to the rounded network as being a pseudonetwork, but I like to keep things simple and describe features as I see them.
Clinically and dermoscopically dermatofibromas should have a good degree of symmetry, lesions should not shows signs of sustained growth, and are palpable under the skin surface often dimpling in the centre when squeezed.
