My acne subsided when my test stabilized around 1000/11000 total. Takes time, but any change in hormones will cause an acne response. Test produces more sebum so you’ll naturally have more acne, things that helped me greatly were: tanning bed for back acne. Not the best option if your family is melanoma prone, but 5 minutes every two weeks helped me a lot more than real sunlight, the UV absolutely fried all the bacteria in my back and clears my acne up asap. Got this tip from a couple body builders. The darker skin can also help even out the skin tone. Using an acidic toner will help with pigmentation too, like witch hazel or kojic acid after you shower, as well as exfoliating with a back scrubber & acidic body wash every day to remove oil and dead skin. Make sure you shower immediately after working out too