You have already learned what good comestic physicians know about black skin. If you traumatize it even a little you can end up with permanent skin discoloration. Do not use anything on your skin that might irritate it without consulting a dermatologist who is well versed on black skin as well as correcting skin tone and texture. Though I am white due to my unseen racial heritage of Native American and African American I also fight this. A little scratch or irritation will leave a permanent unsightly dark spot. My plastic surgeon gave me a prescription creme that helps some.