Phototoxic tar dermatitis

Phototoxic tar dermatitis is a type of skin condition that occurs when the skin is exposed to certain substances and then to sunlight. It is a form of contact dermatitis, which is an inflammation of the skin caused by direct contact with an irritant or allergen.

Causes

Phototoxic tar dermatitis is caused by exposure to certain substances, such as coal tar, and then to sunlight. The ultraviolet (UV) rays from the sun react with the substance on the skin, causing inflammation and damage. This is known as a phototoxic reaction.

Symptoms

The symptoms of phototoxic tar dermatitis can vary, but they often include redness, swelling, and blistering of the skin. The affected area may also feel warm and tender to the touch. In severe cases, the skin may peel or develop a crust.

Diagnosis

The diagnosis of phototoxic tar dermatitis is usually based on the patient's history and a physical examination of the skin. The doctor may ask about recent exposure to potential irritants, such as coal tar, and about sun exposure. A skin biopsy may be performed to confirm the diagnosis.

Treatment

The treatment of phototoxic tar dermatitis involves avoiding further exposure to the irritant and to sunlight. Topical creams and ointments may be used to soothe the skin and reduce inflammation. In severe cases, oral or injectable steroids may be prescribed.

Prevention

Prevention of phototoxic tar dermatitis involves avoiding exposure to known irritants and protecting the skin from the sun. This can be achieved by wearing protective clothing and using a high-factor sunscreen.

See also

• Contact dermatitis
• Phototoxicity
• Coal tar