Marjolin ulcer is an aggressive cancer that develops within poorly healed lesions, burns, or scars. It is a slow growing tumor that can metastasize to brain, kidney, or lungs. Reference: https://www.webmd.com/skin-problems-and-treatments/what-is-a-marjolin-ulcer Image via: https://en.wikipedia.org/wiki/Marjolin%27s_ulcer