2-3 weeks ago i started two different medications, 1 called depakote for headaches and 1 called bactrim for prostitis. two days ago a ton of little red marks, not bumps, appeared on my legs, arms, and chest. my neurologist (headache doctor) advised me to take benadryl pills, and i did and the marks seemed to go away a little. but im concerned; will the marks be permanent if i continue taking a medication that i’m possibly allergic to?