You can develop a skin allergy if your skin comes in contact with an allergen or other substance to which you are (over) sensitive. Usually your immune system protects you from harmful organisms. However, if this system is set incorrectly, your body will also react to harmless substances.
An allergic reaction in your body can manifest itself in many ways, for example in your respiratory tract, digestive tract, or in shock. But it can also show on your skin. It can swell, dry, scarce, red, or burn. You may also experience itching.