If you are taking whey protein and creatine, I would stop them to see if acne improves.
I would take a shower after working out also.
The fact that you have acne with injections may be a bad thing for you but it actually shows that your DHT may have actually gone up, which is not a bad thing.
Read more here since we have discussed this many, many times:
How to treat or prevent acne caused by testosterone.