Phototoxic tar dermatitis
Phototoxic tar dermatitis
Phototoxic tar dermatitis (pronunciation: /ˌfoʊtoʊˈtɒksɪk tɑːr dɜːrməˈtaɪtɪs/) is a type of skin condition that occurs when the skin is exposed to certain substances and then to sunlight.
Etymology
The term "phototoxic" comes from the Greek words "photo-" meaning light and "toxic" meaning poison. "Tar" refers to the substance that can cause the reaction, and "dermatitis" is derived from the Greek words "derma" meaning skin and "-itis" meaning inflammation.
Causes
Phototoxic tar dermatitis is caused by exposure to certain substances, such as coal tar, and then exposure to sunlight. The ultraviolet (UV) light from the sun reacts with the substance on the skin, causing inflammation and damage. This is different from a photoallergic reaction, where the substance causes an allergic reaction when exposed to sunlight.
Symptoms
Symptoms of phototoxic tar dermatitis can include redness, swelling, and blistering of the skin. The skin may also feel painful or itchy. The symptoms usually appear within a few hours of exposure to sunlight.
Treatment
Treatment for phototoxic tar dermatitis usually involves avoiding further exposure to the substance and sunlight. Topical creams and ointments may be used to soothe the skin and reduce inflammation. In severe cases, oral or injectable corticosteroids may be prescribed.
Related Terms
External links
- Medical encyclopedia article on Phototoxic tar dermatitis
- Wikipedia's article - Phototoxic tar dermatitis
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