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What causes lichen planus?

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In most cases, the cause of lichen planus is not known. It is often though to be the result of an autoimmune process where the body’s immune system attacks its own tissues. When lichen planus is caused by a triggering agent such as hepatitis B or C, it is called a lichenoid reaction.

Medications to treat high blood pressure, heart disease, and arthritis can cause lichen planus-type rashes that are allergic reactions to those drugs. Lichen planus is not contagious.

From: Common Skin Rashes WebMD Medical Reference

SOURCES:  

American Academy of Dermatology. 

Australasian College of Dermatology.

Reviewed by Debra Jaliman on August 27, 2019

SOURCES:  

American Academy of Dermatology. 

Australasian College of Dermatology.

Reviewed by Debra Jaliman on August 27, 2019

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How is lichen planus diagnosed?

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