This is an excellent video.
https://www.youtube.com/watch?v=WKLWonDQvbg
BCCs often crust over, appear to be healing, then return.
They do not necessarily have to appear in a sun-exposed area. My small one was on my lower back in an area that was not exposed to sun or UV light. Mine was there for a few years which got my attention.
I could not get a good look at it, since it was small, flaky and on my lower back.
I asked my DH to take a photo of it. I entered the photo into a search engine, and one of the potential IDs was ”Basal Cell Carcinoma.”
While these are not known to metastasize, they can grow deep. Often you can see a network of small blood vessels within them. Dr. Finbar points this out on his video.
I had mine examined by a dermatologist, biopsied, then removed. Easy.
My small BCC on lower back. Note the crusting and small blood vessels.
cyn427 (z. 7, N. VA)
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