Photodermatitis
Photodermatitis (pronounced: fo-to-der-ma-ti-tis) is a medical condition that refers to an abnormal skin reaction to sunlight, or more specifically to ultraviolet (UV) radiation.
Etymology
The term "Photodermatitis" is derived from three Greek words: "photo," meaning light, "derma," meaning skin, and "itis," which typically denotes inflammation.
Definition
Photodermatitis, also known 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. The second and subsequent exposures produce photoallergic skin conditions which are often eczematous.
Symptoms
Symptoms of photodermatitis may include itching, redness, swelling, and blisters. The skin may also darken or lighten, which can be temporary or permanent. In severe cases, sun exposure can cause pain, nausea, fever, and chills.
Causes
Photodermatitis can be caused by certain medications, chemicals, or medical conditions. Some common causes include exposure to the sun while taking certain medications (such as tetracycline), using certain types of perfumes or lotions, or having a medical condition that makes the skin more sensitive to the sun, such as lupus or porphyria.
Treatment
Treatment for photodermatitis usually involves avoiding the sun, using sunscreens, and in some cases, desensitization to the sun through a process called phototherapy. Medications, such as corticosteroids, may also be used to reduce inflammation and itching.
Prevention
Prevention of photodermatitis is primarily achieved by avoiding direct sunlight, using sunscreens with a high sun protection factor (SPF), and wearing protective clothing, such as long-sleeved shirts, long pants, and hats.
See also
External links
- Medical encyclopedia article on Photodermatitis
- Wikipedia's article - Photodermatitis
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