Cephalexin
"I had scalp acne fo 6 months, but several doctors said it wasn't an infection.  So I used every, single known topical stuff, nothing worked from anti inflammatories to natural products.  I went to the gp last week with a urine infection, I said will it clear up my scalp also, yes, but only if it's an infection, which he doubted. .  And,  whoopee my scalp has cleared up and I didn't experience any side effects. Go with your gut diagnosis,  you know yourself better than anyone.. Couldn't recommend this antibiotic highly enough."