Doctors do not know what causes the rash. They do not believe this type of rash is an allergy. Many children get a skin rash after taking ampicillin or amoxicillin. This does not necessarily mean your child is allergic to the medicines, or to other penicillin medicines. read more
Most antibiotics can cause a rash as a side effect. But the antibiotic amoxicillin causes a rash more frequently than other types. Amoxicillin and ampicillin are both derived from the penicillin family. read more
Treatment for an Amoxicillin Rash. Whether treatment is needed for an amoxicillin rash depends on the type. Hives Hives indicate an allergic reaction, and you should stop the amoxicillin treatment immediately. Topical treatments like Benadryl or an oatmeal bath can help manage the itching until the rash goes away. read more
While an amoxicillin rash may not be an allergic reaction, it can be an indicator a patient may have infectious mononucleosis, which is caused by the Epstein-Barr virus, which may live dormant in the bloodstream for some time. read more