I think I have ochronosis, I used mercury and hydroquonine for several years off and on, last june I had microdermabrasion and began to have rapid darkening, I went into a panic and did more exfoliation, used apple cider vinegar went to two different dermatologist one said I have ochronosis and that I could cure it by using dermanland and the other said I have melasma and wants to give me more hydroquonine, please help my face is face shades darker, very patchy and looks ashy and old looking, help!