skin allergy test preparation by doctor on a patient hand showing the allergic hypersensitivity reaction wheal swelling

allergen allergenic allergic allergisation allergization allergy analysis animal arm asthmatic check clinical cuticle doctor drop epidermis erythema erythrodermia evidence experiment fever fleam hair hand hay healthcare hypersensitive hypersensitivity laboratory lancet liquid medical medicine patient pipette pollen practice preparation pricktest procedure reaction reddened redness sensitization sensitizing showing skin surgery swelling test wheal