The lesion projects upwards from the skin surface in the shape of a dome. The colours of dermatofibroma vary. The classical DF has a pink or flesh-coloured centre with a pale brown periphery. Other colours are orange, yellow, red, or sometimes even purple, blue, or black. The size ranges from 3 to 10mm.
When squeezed between the finger and thumb, the hard nodule sinks below the skin (the “dimple sign”). Don’t pinch too deep! Just pinch the surface of the skin skin to feel a very firm lesion.