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2. Seasonal affective disorder - Wikipedia

   en.wikipedia.org/wiki/Seasonal_affective_disorder

   The evidence base for light therapy as a preventive treatment for seasonal affective disorder is limited. [44] The decision to use light therapy to treat people with a history of winter depression before depressive symptoms begin should be based on a person's preference of treatment. [44]

3. 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 ...

4. Hives - Wikipedia

   en.wikipedia.org/wiki/Hives

   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 ]

5. Doctors call attention to 'margarita rashes' from sun ... - AOL

   www.aol.com/news/doctors-call-attention...

   Handling certain foods like limes and then going into the sun may cause an itchy rash or sunburn on areas of the body that the citrus juice touched. In severe cases, people may develop blisters ...

6. Physical urticaria - Wikipedia

   en.wikipedia.org/wiki/Physical_urticaria

   Physical urticaria is a distinct subgroup of urticaria (hives) that are induced by an exogenous physical stimulus rather than occurring spontaneously. [1] There are seven subcategories that are recognized as independent diseases. [2] [3] Physical urticaria is known to be painful, itchy and physically unappealing; it can recur for months to ...

7. Dermatographic urticaria - Wikipedia

   en.wikipedia.org/wiki/Dermatographic_urticaria

   Symptoms are thought to be the result of histamine being released by mast cells on the surface of the skin. Despite the lack of antigens , histamine causes the skin to swell in affected areas. If the membrane that surrounds the mast cells is too weak, it will easily and rapidly break down under physical pressure, which then causes an allergic ...