question: Allergic reaction with unknown cause. Swollen lips. Swollen feet. Tingling/numbness in mouth. Have been on bactrim antibiotics for other issue. Have not been exposed to anything out of the ordinary that I am aware of. Red dots all over body. Dots do not itch. Took Benadryl and saw improvements until medicine wore off. What do I need to do? Is there another non-prescription med available?