Welcome to HealthcareMagic forum
Normally in this young age there cant be any hormonal
cause. Since your tanning
of skin has been started sudden, and you are also on prolonged medication, it points to some drug side effects. You havent mentioned what medicines you are taking presently, but better thing is to visit your physician who will do local examination and find out some alternative treatment for the RA. cosmetic view is always imp in case of a young girl, so please visit fast.
you can go the beauty treatments only after once you confirm your skin to be normal. threadingg generally dont cause any harm.
I hope I have answered your question. Wish you good health..