This dark spot on the patients back was confirmed to be a mildly atypical compound melanocytic naevus. , What does this mean?, A mildly atypical compound melanocytic nevus is a benign Non melanotic subcutaneous nodules on the trunk, arms, scalp and face Download Scientific Diagram A nevus is a benign (non cancerous) melanocytic tumor, more commonly called a mole. Will it develop into an issue? Find out. Non Melanoma Skin Cancer Symptoms of non melanoma skin cancer NHS