Lichen planus
Definition
Lichen planus is a disease in which there is an itchy, swollen rash on the skin or in the mouth.
Overview, Causes, & Risk Factors
The exact cause of lichen planus is unknown. However, it is likely to be related to an allergic or immune reaction. Risks include: - Exposure to medications, dyes, and other chemical substances (including gold, antibiotics, arsenic, iodides, chloroquine, quinacrine, quinide, phenothiazines, and diuretics)
- Disorders such as hepatitis C
Lichen planus generally affects middle-aged adults. It is less common in children.
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