How to get rid of skin discoloration. ?

I have psoriasis, and I've been using a new medicine that wors very well! However, the skin where the psoriasis was is now discolored. I'm african american, and italian, so I'm slightly dark & need the skin where the psoriasis was to become darker. Please help me! Oh & mind you, I'm only 14, so no laser stuff & nothing harmful! Thankyou(: