Skin Rash Which Is Spreading To Other Parts Of Body.onset

Skin rash which is spreading to other parts of body.onset was last night. I am in Fla and concerned it could be Zeka virus. Went to pharmist who told me to take 2 Benadryl every 4 hours. M concerned because rash keeps spreading. Went from below elbows on both arms to neck and spreading to chest area