![]() One of the most interesting facts about contact dermatitis is that it can occur to any product or ingredient, even one you’ve been using for a very long time. We routinely see people who suddenly develop a rash from a hair dye or cosmetic product they’ve used for years. Skin thickening tends to occur with rashes that have been ongoing for a long time.Symptoms will gradually improve once the offending trigger is avoided. In both types of dermatitis, long-term exposure can cause several chronic changes to the skin, like thickening or cracking. ![]() It can occur quickly after contact, especially if it was a chemical exposure. Irritant contact dermatitis causes a red, sometimes swollen rash that tends to be more painful and irritated rather than itchy. In more severe cases, blistering may occur, or the rash might spread beyond the initial area of contact. For example, someone with a nickel allergy who wears nickel-containing earrings might only have the rash on their earlobes. ![]() The rash is usually red, scaly-looking, and just where the allergen touched the body. Allergic contact dermatitis causes a rash with intense itching that occurs hours to days after exposure. ![]()
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