I did TCA at 90% at home on an old scar and got burned. First Itime went brown then a month later it peeled off leaving the skin with no pigment and a dark circle around. Unfortunately I went in the sun accidentally and the skin now looks dark. I had lasers and all sorts of cream for hyperpigmentation but nothing has worked. Someone told me a Phenol peel 88% could fix it? How do I fix it?