A dermatofibroma is a small, firm, brown or reddish bump that develops in the connective tissue beneath the skin. It's fairly common and not dangerous. It's often mistaken for a mole. It occurs more often in women. It appears most often on the legs and arms, though it can develop on other areas of skin too. The lesion begins as a mark and develops a firmness that can be felt on touch over time. The exact cause of dermatofibromas isn't known, but triggers such as insect bites, hair follicle infections and minor injuries may play a role.
Symptoms
Appearance: Small, round nodules, usually brown or reddish in colour.
Feel: A firm, rubbery sensation. This develops over time.
Pain or itching: Usually painless, but can cause itching or sensitivity in some people.
Dermatofibromas are benign lesions. Diagnosis is made through clinical examination and dermatoscopy. Treatment isn't necessary, but if it causes cosmetic concern, surgical excision, cryotherapy and laser methods can be used.
If you have a suspicious lesion on your skin that is growing quickly or changing in colour and shape, it would be appropriate to be assessed by a dermatologist for a differential diagnosis.