Medically reviewed by Brendan Camp, MD The dermatofibroma pinch test is a simple way to tell if the bump on your skin is a mole or a benign (harmless) growth called a dermatofibroma. If you pinch a ...

This growth may be a sign of a rare type of cancer called dermatofibrosarcoma protuberans. Primary care doctors and dermatologists will usually diagnose a dermatofibroma by inspecting it visually.