I am 75 and my skin tears easily on my lower arms. I reached up to a top shelf in a cabinet and the latch hook jabbed into my skin and went deep in one spot and tore my skin. two flaps of skin separated from the underlying skin . They have reattatched, but there is a small end of one that is necrotic. I have been using alternate hot water with some salt and then cold pack. cleaning with peroxide and then a good triple antibiotic and loosely bandaging it. It is healing great except that there is a tiny area of black skin. I want to continue to treat it myself. Any suggestions to help? It is dry.