My husband has some keloid scars from a burn and we are using a mix of 50% SSKI and 50% DMSO on them. SSKI won't really show on the skin because it isn't brown like iodine. You can use it without the DMSO if you don't have any but the DMSO is supposed to increase absorption.
We just started a few days ago and I think the smaller scars have gotten a little less already, but it's hard to tell.