Symptoms

The signs and symptoms of lichen planus vary depending on the areas affected. Typical signs and symptoms are:

• Purplish, flat bumps, most often on the inner forearm, wrist or ankle, and sometimes the genitals
• Itching
• Blisters that break to form scabs or crusts
• Lacy white patches in the mouth or on the lips or tongue
• Painful sores in the mouth or vagina
• Hair loss
• Change in scalp color
• Nail damage or loss

When to see a doctor

See your doctor if tiny bumps or a rash-like condition appears on your skin for no apparent reason, such as a known allergic reaction or contact with poison ivy. Also see your doctor if you experience any signs or symptoms associated with lichen planus of the mouth, genitals, scalp or nails.

It's best to get a prompt and accurate diagnosis because a number of skin and mucosal conditions can cause lesions and discomfort.