I wanted to report my success with a new treatment plan because I am incredibly happy with the results.
I am not 100% cured yet, I do not expect to be, but this has significantly reduced my breakouts to almost non-existent!
My back acne was to the point of uncomfortable when I would lay down, causing me pain. I have not been formally diagnosed, no idea what type of acne I have. I DO have a tendency towards cystic acne on my face (diagnosed), so I imagine that is likely what's going on throughout my body.
I began a regimen of salicylic acid body wash (2% - multiple brands) and that did not touch it. I also tried peroxide-based cleaners & still no luck. I used rubbing alcohol in my teenage years with some success & decided to give it a try again.
To be safe, I dilute it with witch hazel (50-50 mixture in a spray bottle approximately 4 ounces). I also add about 30 drops of tea tree oil, but you can certainly add more if you can manage the pungent scent & tingling sensations on your skin.
Really, you do not need the witch hazel. I did this for its toning properties & to reduce the drying effects of the alcohol. If you wanted to use distilled water, that would be fine too. I use this mixture morning before I dress & evening after a shower. It MAY sting just a little bit, particularly after the shower when your pores are opened. If that's unbearable to you, don't use the alcohol & stick to the witch hazel (& perhaps try diluting that with distilled water as well, just in case).
This has helped reduce my breakouts so much, I no longer fear wearing backless dresses or being on the beach. I will occasionally get a few here & there, but I no longer have entire patches of acne on my back & the lifespan of the few pimples I do get is reduced to about 2 days with this therapy.
After 3 years of cyclical body acne, I'm happy to say it's manageable. I think with continued therapy of the tea tree oil, it will only get better. I wish you the best of luck!