The photo you have uploaded shows what we dermatologists call a clinically atypical pigmented lesion or neoplasm of uncertain behavior. This means it has several features we consider abnormal, but we cannot tell the exact diagnosis (mole, lentigo, abnormal mole, pigmented basal cell carcinoma, malignant melanoma, etc.) just by looking at it with our eyes or the aid of an optical instrument called a dermatoscope. The abnormal features in your lesion are: asymmetry, border irregularity and color mixture. These are the first three criteria in the ABCDE acronym we teach patients for finding possible malignant melanoma during their recommended monthly self-skin exams. From the photo, I cannot tell the size of the lesion, but it appears to be larger than a standard pencil eraser diameter. This would mean it also fits the fourth criterion,D - diameter greater than 6mm. The final, and most important criterion is E, for evolving (changing in any feature: size, shape, color, symptoms, etc.). For all of these reasons, I strongly recommend you see a dermatologist or your primary care provider to have the lesion evaluated in person and potentially removed for biopsy. Be well and thank you for posting your question.
