Common benign melanocytic tumours Stamford Skin Centre Non melanocytic lesionspreventing pitfalls in diagnosis Managing non melanoma skin cancer in primary care: A focus on topical treatments BPJ 57 December 2013 In this month's IDS webcast, Dr. M. Buljan discusses the topic of Pigmented Nail Lesions. In this webcast, detailed dermatoscopy tips for diagnosing nail matrix melanoma and other causes of longitudinal melanonychia, Brown spots, especially on the lips, can be alarming to some. In some instances it can indicate rare oral mucosal melanoma, however in this case it was a non cancerous labial melanotic macule.