General Facts


Signs that a lesion is not melanocytic


Dermoscopy is useful but only afford a correct diagnosis in 50% of cases. It all has to do with detecting a regular pattern or an irregular pattern,


A biopsy is warranted for the following:


Make sure that the biopsy is thorough and not just a superficial sample. Getting a report of hyperkeratosis can actually miss the bulk of the lesion and miss the diagnosis.

pigmented longitudinal streaks in children are almost always benign


Excised melanoma is better if possible than amputation. No recurrence is the norm according to breslow thickness (which is the same as anywhere else on the body).


If there is a single digit dystrophy resembling psoriasis or Lichen Planus (LP), it could be amelanotic melanoma or squamous cell carcinoma. Psoriasis or LP tend to affect multiple digits.



Source of Information. CO9. De Berker. Hair and Nail Diseases. 2011 (10) – 20th Annual Congress of the EADV (European Academy of Dermatology and Venerology) – Lisbon (Lisboa), Portugal