Lichen planopilaris is a skin disease that affects the scalp and can cause scarring alopecia, states the American Osteopathic College of Dermatology. This type of skin disease causes hair loss due to inflammation in the hair follicles.
Lichen planus is a common skin condition that can affect the skin, mouth, nails or hair, states the American Osteopathic College of Dermatology. When it affects the scalp and hair, it is known as lichen planopilaris, and it can cause patchy hair loss. If the skin condition affects the scalp, physicians usually prescribe oral steroids, topical steroids, Accutane or hydroxychloroquine. Antihistamines are also prescribed to help treat itching, another common symptom of lichen planus.