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  2. Solar urticaria - Wikipedia

    en.wikipedia.org/wiki/Solar_urticaria

    Solar urticaria is an immunoglobulin E-mediated hypersensitivity that can be introduced through primary or secondary factors, or induced by exogenous photosensitization. [15] [16] Primary SU is believed to be a type I hypersensitivity (a mild to severe reaction to an antigen including anaphylaxis) in which an antigen, or substance provoking an immune response, is "induced by UV or visible ...

  3. What are hives? A dermatologist explains

    www.aol.com/news/hives-dermatologist-explains...

    Hives, or urticaria, are itchy pink welts that could appear anywhere on your skin. Some are bumps as small as a pinhead, while others may merge together to cover large patches of your skin.

  4. Photodermatitis - Wikipedia

    en.wikipedia.org/wiki/Photodermatitis

    Photodermatitis, sometimes referred to as sun poisoning or photoallergy, is a form of allergic contact dermatitis in which the allergen must be activated by light to sensitize the allergic response, and to cause a rash or other systemic effects on subsequent exposure.

  5. Hives - Wikipedia

    en.wikipedia.org/wiki/Hives

    Hives, or urticaria, is a form of skin rash with red, raised, itchy bumps. [1] They may also burn or sting. [2] Hives can appear anywhere on the surface of the skin. Whether the trigger is allergic or not, a complex release of inflammatory mediators, including histamine from cutaneous mast cells, results in fluid leakage from superficial blood ...

  6. Chronic spontaneous urticaria - Wikipedia

    en.wikipedia.org/wiki/Chronic_spontaneous_urticaria

    The most common symptoms of chronic spontaneous urticaria are angioedema and hives that are accompanied by itchiness. Chronic spontaneous urticaria, despite its cause being unknown, is linked to a higher prevalence of autoimmune diseases , and is often worsened by triggers like stress, infections, certain foods, or nonsteroidal anti ...

  7. Dermatographic urticaria - Wikipedia

    en.wikipedia.org/wiki/Dermatographic_urticaria

    Dermatographic urticaria is sometimes called "skin writing", as it is possible to mark deliberate patterns onto the skin. The condition manifests as an allergic-like reaction, causing a warm red wheal to appear on the skin. As it is often the result of scratches, involving contact with other materials, it can be confused with an allergic ...