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 Penicillin Allergy Testing at the University of Maryland Medical Center's Allergy Clinic The Elm Approach to beta lactam allergy in critical care EMCrit Project Salicylate Sensitivity: Symptoms and How To Manage Akron woman experiences rare skin reaction after allergic reaction to medication Drug Allergies UF Health