On your arm? You MIGHT be a candidate for the bloodroot salve. You have to follow directions exactly. Which is to apply only enough to just reach the edges of the spot, cover and leave on over night, wash off and re-apply and then keep it covered and keep the edges moist with the yellow healing salve until the whole thing ultimately comes out. When it does, keep the hole packed with healing salve and covered. In theory, the hole should fill in. Mine did most of the way, but there will be a scar and/or slight depression left if I am any indicator.
Not to worry, I am still pretty - in a pirate sort of way. LOL. Actually, just one place is very noticeable. I just tell them that the other guy's knife missed my eye a bit. Or sometimes I say that the gal's husband returned unexpectedly and I am lucky that he only had birdshot in his shotgun . . .