Penicillin Allergy Testing at the University of Maryland Medical Center's Allergy Clinic The Elm Peptide injections can sometimes cause redness or itching at the injection site, but most of the time this is not a true allergy. In the skin, we have mast cells that contain Salicylate Sensitivity: Symptoms and How To Manage Drug Allergy Allergy and Asthma Center of Duncanville Approach to beta lactam allergy in critical care EMCrit Project Akron woman experiences rare skin reaction after allergic reaction to medication