Definition

Lichen planus is a chronic skin condition. It causes itchy, flat, scaly patches on the wrists, legs, trunk, or genitals. It can also affect the inside of the mouth and vagina where it resembles a white spider web. The scalp and fingernails can also be affected. Lichen planus may continue on and off for months or years.

Section of Skin with Lichen Planus
Lichen Planus
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Causes

Not much is known about the cause. It may be due to genetic factors, certain medicine, or diseases.

Risk Factors

The condition is more common in those aged 30 to 60 years.

Lichen planus is more likely to occur in the presence of:

Symptoms

Lichen planus may cause:

  • Itching, flat-topped purplish bumps or scaly patches—especially on the palm side of the wrists, the top of the foot and shins, the trunk, or the genitals
  • Hair loss
  • Abnormal appearance to the nails
  • Milky-white, spider web-like patches in the mouth or vagina, with or without burning or discomfort

Diagnosis

You will be asked about your symptoms ad past health. The doctor will also need to know any medicines you are taking. A physical exam will be done. Lichen planus usually can be diagnosed by the appearance. You may be referred to a skin specialist.

If the diagnosis is unclear, a skin biopsy may be done.

Treatment

Talk with your doctor about the best plan for you. Treatment options include the following:

Symptom Relief

Scratching makes this condition worse. This symptom can be eased with:

  • Antihistamines creams or lotions or pills
  • Other anti-itching lotions, such as menthol or eucalyptus oil
  • Soothing oatmeal baths

Steroid Medications

Steroids creams may be used to help decrease inflammation. Steroids may also be injected by a needle directly into the area. Steroid pills are only used in severe cases.

Other Treatments

  • Retinoids or immunomodulating medicine may be useful. They are more often used for lesions in the mouth or vagina.
  • Ultraviolet light therapy may help if lesions are widespread. It is combined with pills that make it more effective.

Prevention

There are no current guidelines to prevent lichen planus. Avoid any medications that may have triggered it in the past.

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