Allergic eczema occurs when the skin comes into direct contact with an allergen. This type of allergic reaction is known as a delayed allergy, as symptoms may not appear until 24 to 48 hours after exposure to the allergen. It often takes multiple exposures to trigger a response.
While allergic eczema can be caused by an immune response to various substances, some of the most common allergens include:
In some cases, allergic eczema can develop when the skin is exposed to chemicals in the presence of sunlight, such as after using sunscreen and spending time outdoors.
Symptoms of allergic eczema can vary from person to person and may change over time. Typically, symptoms develop at the site where the skin directly contacts the allergen, but in rare cases, they can spread to other areas. Common symptoms include:
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