The signs and symptoms of lichen planus vary depending on the areas affected.
Typical signs and symptoms include:
- Purplish, flat-topped bumps, most often on the inner forearm, wrist or ankle, but sometimes on the external genitals
- Blisters that may break to form scabs or crusts
- Lacy white patches in the mouth — inside the cheeks or on the gums, lips or tongue
- Painful oral or vaginal ulcers
- Hair loss and scalp discoloration
- Nail damage or loss