I got my first tattoo about a month ago and on one side of the tattoo my skin is darker in the form of a rectangle almost. The skin is not bumpy, no rash, and does not hurt at all. The tattoo looks quite good and is not infected or anything and has completely healed. At first I thought it was Saniderm residue, but it just won’t come off. I asked my tattoo artist about it and showed a picture to him but he says he hasn’t seen such a reaction. Any advice or any sort of insight would be appreciate!