Linear lichen planus is a rare form of lichen planus, a chronic inflammatory skin condition. It is characterized by a line of itchy, scaly, purple-red bumps that appear on the skin. The line of bumps can be straight or curved and usually appears on the arms, legs, or trunk. Linear lichen planus can be uncomfortable and may cause scarring. Treatment typically involves topical corticosteroids or other medications to reduce inflammation and itching.

The most common symptoms of linear lichen planus include:

-A line of itchy, raised, purplish-red bumps on the skin
-Thickened, scaly patches of skin
-Hair loss along the line of bumps
-Discoloration of the skin
-Painful sores or blisters
-Burning or stinging sensation in the affected area

The exact cause of linear lichen planus is unknown, but it is believed to be related to an autoimmune disorder. It is thought that the body's immune system mistakenly attacks the skin cells, leading to inflammation and the formation of the characteristic rash. Other possible causes include exposure to certain medications, chemicals, or metals, as well as viral or bacterial infections.

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

2. Oral corticosteroids: These are taken by mouth and 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.

8. Laser therapy: This involves using a laser to

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

2. Exposure to certain chemicals, such as formaldehyde, arsenic, and mercury.

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

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

5. Exposure to certain foods, such as shellfish and peanuts.

6. Stress.

7. Certain medical conditions, such as hepatitis C and HIV.

8. Certain skin conditions, such as psoriasis and eczema.

9. Family history of linear lichen planus.

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