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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 ...
Hives, also known as urticaria, is a kind of skin rash with red and/or flesh-colored, raised, itchy bumps. [1] Hives may burn or sting. [ 2 ] The patches of rash may appear on different body parts, [ 2 ] with variable duration from minutes to days, and do not leave any long-lasting skin change. [ 2 ]
26 pictures of skin rashes to help you identify your skin rash. ... They can range in size from small mosquito-like bites or develop into larger patches on the body, she adds. Hives are caused by ...
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 ...
The bacteria releases a toxin that causes a bright red blotchy rash that has a sandpaper-like texture, and the rash can spread to the entire body and usually first appears on the groin, neck, and ...
The body has an immune response that can cause discomfort and intense itching, explains Sumayah Jamal, MD, the director of the Skin of Color Specialty Clinic at Schweiger Dermatology Group in New ...
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-inflammatory drugs. The hives and angioedema seen in CSU is thought to be linked to the degranulation of skin mast cells.
Normally, this would leave a red mark that goes away within about 10 minutes, Hu explains. But if someone has dermatographism, it can develop into a longer-lasting raised mark or even hives, she says.