A garnishment cancer?
(Sorry ... I couldn't resist.

)
But about the Big C and the AME ...
According to the info I was given recently, Basal and Squamous tumors, once removed and requiring no further care, are nothing but a big ugly mole as far as the FAA is concerned.
If you have a malignant melanoma ... which by the time you find it, will likely have metasticized somewhere ... well, then you have full-blown Cancer and are no longer fit to fly. At the same time, a cutaneous melanoma is kinda iffy. You'll be checked from head to toe to see if any of these critters have released anything into your bloodstream. It'll be very clear to you.
If you're asking because you have it ... best wishes for a good outcome. And PM if I can help in any way whatsoever. Seriously!
Unchecked skin issues can be a heartbreaker, guys. Don't blow it off. By the time a non-cutaneous melanoma is becoming a big enough problem for you to worry and get to a doctor, bad things can have already happened. Those little beasts will shed cells into your bloodstream quicker than ANY other kind of tumor.
Minh