physical allergy, a hypersensitive reaction to physical factors, such as cold, heat, light, or trauma. Common characteristics include pruritus, urticaria, and angioedema. Usually specific antibodies are found in people having physical allergies. Photosensitivity may be caused by the use of certain cosmetics or drugs. Prophylaxis typically includes an attempt to remove the stimulus, and treatment involves the use of antihistamines or steroids. Compare contact dermatitis. See also atopic dermatitis.
