An allergic reaction, or when your immune system overreacts to a harmless substance, can sometimes manifest in the form of a rash. An allergy rash can be uncomfortable and lead to infections ...

All antibiotics can cause drug rashes — as can antiseizure and antigout medications and even over-the-counter medications like NSAIDs. And while some patients have severe reactions, the majority ...

contain detectable amounts of penicillin. These amounts (1 to 200 units per milliliter) are sufficient to produce an allergic reaction in patients exquisitely sensitized. 1 In addition to this ...