Solar urticaria
Solar Urticaria (pronounced: so-lar ur-ti-ca-ri-a) is a rare condition that affects the skin. It is a type of photosensitivity, and is characterized by the development of urticaria (hives) after exposure to sunlight or artificial light sources emitting ultraviolet (UV) radiation.
Etymology
The term 'Solar Urticaria' is derived from the Latin word 'sol' meaning 'sun', and the Latin word 'urtica' meaning 'nettle'. The suffix '-aria' is derived from the Latin '-arius' meaning 'pertaining to'. Thus, 'Solar Urticaria' can be translated to 'sun nettle rash'.
Symptoms
The primary symptom of Solar Urticaria is the rapid onset of hives on areas of the skin exposed to the sun. Other symptoms may include itching, redness, and swelling. In severe cases, exposure to sunlight can lead to anaphylaxis, a severe allergic reaction.
Causes
The exact cause of Solar Urticaria is unknown. It is thought to be an allergic reaction to a compound in the skin that is altered by UV radiation. Some people may have a genetic predisposition to the condition.
Diagnosis
Diagnosis of Solar Urticaria is typically made based on the patient's history and physical examination. A phototest may be performed to confirm the diagnosis. This involves exposing a small area of the skin to measured amounts of UV radiation to see if hives develop.
Treatment
Treatment for Solar Urticaria typically involves avoiding sun exposure and using sun protective measures such as wearing protective clothing and using sunscreen. Medications such as antihistamines may be used to manage symptoms. In severe cases, immunotherapy or plasmapheresis may be considered.
Related Terms
- Photosensitivity
- Urticaria
- Ultraviolet
- Anaphylaxis
- Phototest
- Antihistamines
- Immunotherapy
- Plasmapheresis
External links
- Medical encyclopedia article on Solar urticaria
- Wikipedia's article - Solar urticaria
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