The most common type and easily remedied skin cancer when caught early. Mine eventually presented within a pink mole that started to itch. Basically it's cellular proliferation that runs amok. I had a biopsy and then surgery. I remember the cancer looking like a perfect pearl after it's removal. Yes, there is a scar.
Did you know that there are melanomas that can occur in cells that do not make melanin? This is challenging to diagnose and is known as "amelanotic melanoma".