When I first started real HRT, I was taking HC + HCG mono, and broke out with cistic acne on my back. Accutane killed that in it's tracks (now treating scars from it).
Then I switched to test + hcg, things were ok.
Switched to gel + hcg.... now I have acne on my arms / shoulders, but treatment feels much better.
I'm using a gel on my arms called Ziana that combines clindamycin + tretinoin, and it helps a lot. Using a bleaching cream on the scars on my back and it seems to help, but I may opt for dermabrasion or something surgical to fix the scars... $hit really sucks, can't go to the beach or feel comfortable with my shirt off.