Skin allergy can be caused by a variety of factors. These include immune system disorders, medications and infections. When an allergen is responsible for triggering an immune system response, then it is an allergic skin condition.
That’s when you encounter something your body thinks is dangerous, called an allergen. Your immune system overreacts, and releases antibodies to fight off these “invaders.” That fight triggers symptoms like a rash or swelling.
People who have allergies react to things that wouldn’t bother most others. Anything from plants like poison ivy to hair dyes and fragrances found in everyday products might be allergens.
You could also have an allergic reaction to something in the air that settles on your skin, like pollen, chemical sprays, powders, fibers, or cigarette smoke. This is called airborne contact dermatitis, and it mostly happens on eyelids, head, and neck.