Big red welts as an allergic reaction

It is hard to tell what the big red welts on the cheek are without seeing them. No data was given about how long you used the antibiotic on them, but if it was sufficient for one or two weeks then the welts are not caused by bacterial infection. They might be caused by an allergic reaction. What caused the allergic reaction might be hard to find out.

You might think of any changes that happened recently (before the welts appeared) like: change of shampoo, soap, other hygiene products, make-up, change of sheaths, sudden change in diet, environmental changes (at home, work, weather related) etc.


You might want to visit a dermatologist for a visual inspection of the welts. If they are detected as an allergy, allergy tests might be recommended to try to detect the substance you are allergic to. Avoiding contact with that substance would be long term treatment, whereas the doctor might recommend an antihistaminic to decrease the welts and other symptoms of allergy.