My daughter was on Adderall for several years, she developed acne that was severe as well, when I took her to her dermatoligist he was aware that many of his patients had been experiencing the same problem, so he took my daughter off the
adderall and put her on a new medication called
Vyvanse, since then she has been acne free, good luck
and I hope this helps, by the way my daughter is 17.