Hello and welcome to MedHelp and our forums. We are sorry you have found us when worrying about cancer. But we are glad to try to help you. Here is an older post in which one of the physicians from our site answered. https://
www.medhelp.org/posts/Dermatology/Bruise-Like-Spot-that-Itches/show/595474. He asked if the area in question looked like a fading bruise. Would you describe yours as that as well? His summation was that this was most likely a fungal issue. Here is some information on fungal issues and the skin https://www.emedicinehealth.com/fungal_skin_infection_vs_eczema/article_em.htm#what_is_a_fungal_skin_infection. The question I have, however, is if the spot itches at all?
By the way, is there any chance this could literally be a healing bruise?