Senior Airman Catherine Settles, 633rd Medical Group aerospace medical technician, numbers a baby’s back to record which allergen will be applied for a skin prick test, Feb. 21, 2013, at U.S. Air Force Hospital Langley, Va. The allergy clinic also conducts skin patch and oral challenge tests in order to find a patient’s allergies. (U.S. Air Force photo by Airman 1st Class Austin Harvill/Released)