pharyngitis
"Was prescribed Keflex (cephalexin) as treatment for strep throat. Had always been given penicillin prior with no side effects. After 1 full day of dosing I noticed a recurring itch on chest. Chest was speckled with tiny red spots and looked as if I had gotten into insulation or something similar. Went to bed and awoke to a full on rash over entire body that resembled mumps, eczema,  or chickenpox.  Not pleasant at all to see, to say nothing of the unbearable itchiness. Did not experience any anaphylaxis or tongue swelling. Prescription was switched to penicillin that morning at doctor office and rash subsided in a few days. My children have been prescribed this recently and I have not handled dosing them for fear of contact with drug."