Tea tree oil will help dry the fuckers out.
Also try 3-5 grams of B5 a day for a week. It helps some people clear up their cystic acne. If you happen to be one of those people after a week simply take a gram a day for maintenance. I got this tip from some bodybuilders and juiceheads who know their fucking shit. I plan on ordering some B5 myself to try because my back is fucked from my Tren Ace dose and Superdrol. I will say though, since I started using Ipamorelin, a growth hormone releasing peptide, my skin as cleared up amazingly.
Have you also considered that the marks on your neck might not be steroid related? If I shave too frequently I get ingrown hairs which can lead to painful boils. Luckily I haven't had any for years because after I shave I always apply Bump Stopper 2 cream and Liquid Bump Stopper. Use it on my face as well where I shave. Ever since then I have had no boils, blemishes, or acne on my face and neck.
Invest in a brush for your back, a bristled long handled one. Scrub with salyic acid wash and tea tree oil wash. Also scrub with st. ives apricot scrub to exfoliate and remove dead skin. The first few times you scrub it will be a little painful and uncomfortable but you will get used to it. Don't worry about damaging the skin on your back, it's much thicker than skin on your face and arms which makes acne treatment a pain because it takes longer for topical treatments to soak in.
