Annular lichen planus is a type of skin condition that is characterized by raised, scaly, and itchy patches on the skin. It is caused by an autoimmune reaction, and it can affect any area of the body, including the scalp, nails, and mucous membranes. Treatment typically involves topical corticosteroids and antihistamines.

The most common symptoms of annular lichen planus include:

-Raised, ring-shaped patches on the skin

-Itchy, scaly, or inflamed skin

-Discolored patches of skin

-Thickened patches of skin

-Blisters or ulcers on the skin

-Hair loss in the affected area

-Painful or tender skin in the affected area

The exact cause of annular lichen planus is unknown, but it is believed to be an autoimmune disorder. It is thought to be triggered by certain medications, infections, or other environmental factors. Other possible causes include allergies, stress, and genetic predisposition.

1. Topical corticosteroids: These are the most commonly prescribed treatment for annular lichen planus. They can be applied directly to the affected area to reduce inflammation and itching.

2. Oral corticosteroids: These are prescribed in more severe cases of annular lichen planus. They can help reduce inflammation and itching.

3. Phototherapy: This involves exposing the affected area to ultraviolet light. This can help reduce inflammation and itching.

4. Immunosuppressants: These medications can help reduce inflammation and itching.

5. Antihistamines: These medications can help reduce itching.

6. Topical calcineurin inhibitors: These medications can help reduce inflammation and itching.

7. Oral retinoids: These medications can help reduce inflammation and itching.

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1. Exposure to certain medications, such as antibiotics, antimalarials, and nonsteroidal anti-inflammatory drugs (NSAIDs).

2. Exposure to certain chemicals, such as formaldehyde, nickel, and chromates.

3. Exposure to certain metals, such as gold, silver, and mercury.

4. Exposure to certain plants, such as poison ivy and poison oak.

5. Stress.

6. Genetics.

7. Autoimmune disorders, such as lupus and rheumatoid arthritis.

8. Infections, such as hepatitis C and HIV.

There is no cure for annular lichen planus, but medications can help reduce symptoms. These include topical corticosteroids, topical calcineurin inhibitors, oral corticosteroids, and oral retinoids.