Wondering if anyone knows if there are specific characteristics that distinguish clearly between the two (dermatofibroma vs. Nodular Melanoma)? I have a history of several dysplatic (i call them my "crazy moles"!) removed in last 5 years, with the worst one on my back which came back as Melanoma In Situ...no problems in last 3 years, then recently (in last 2 months) a new "growth" on my right shin emerged. I'm having it removed/biopsy in a couple of weeks....it's growing, sort of tan color, like a mole, but raised....is/are there any specific characteristics that tell these 2 apart from visual appearance? thx!