Lentigo maligna melanoma
This odd lesion had been growing over a year or so on a middle aged white person’s leg.
Take one look, its an ugly duckling that fails ABCD.
We don’t like this very much, it is Asymmetrical, has an irregular Border, has mixed Colour and is well over 6mm Diameter, so that’s a big fail on ABCD. Let’s see if the dermoscope adds anything.
Applying the Kittler algorithm, is it chaotic? Yes. Is it a seborrhoiec keratosis? No. There are no features of a seborrhoeic keratosis (e.g. fissures, keratin, comedo like openings, milia like cysts, cerebriform appearance) to be seen.
Are there any clues? Yes, there is reticular network and also globules, therefore we can say with some confidence that this is a melanocytic lesion. A chaotic looking melanocytic lesion with a history of recent change ‘goes for a swim’ (in a pot of formalin en route to the histopathologist).
Diagnosis: lentigo maligna just turning into a thin melanoma. Very strong (close to 100%) prospect of a complete cure through simple surgery.
Got a funny looking, new or changing mole? Get it checked-melanoma is eminently curably if removed early. Do not wait for it to get thick and bleeding, the prospects are different then.