I've been getting my back and shoulders waxed for 10 + years, faq if I didn't they could have shot me as an extra for Chewbacca in Star Wars "gwaaaaargggghh" (Chewy impersonation lol) - anyway those red bumps are most likely a bacterial infection, my doc usually would give me a antibiotic for really bad cases.
But those were worse case scenarios...
When I don't keep my back clean (back scrubber and then use Tend skin on it after shoer) my back get's broken out and red spots, just the nature of the beast.
Summer is the worst cause I sweat like crazy just by looking outside (no I'm not a fat kid LOL)
1. Get Tend Skin (sht burns but cleans your pores)
2. Evoclin is prescription stuff that is like napalm to break outs - when you absolutely need to clear out the enemy
3. Try NOT to keep your sweaty shirt on any longer than necessary after lifting, ESPECIALLY if you waxed recently. (I sweat like a whore in church so it's tough for me in the gym to stay dry - fk under armour is the sht!).
4. Hit the tanning bed, the UV light kills the bacteria that infects your follicle, but then again it also mutates the cells in the epidermis...tit/for tat I guess. Ah tits....anyway I digress...
OK that is my 2 cents.
Later