Linear lichen planus: what to know

The lesions may appear as itchy, flat-topped, purple, brown, or reddish bumps arranged in a narrow track. A line can occur on an arm, leg, or another area and may reflect how inflammation follows a particular skin pattern. The shape is a clue, not a diagnosis: scratches, infections, birthmarks, and other rashes can also look linear. A dermatologist assesses texture, colour, distribution, and any similar changes elsewhere.

Avoid rubbing, picking, and repeated shaving over the area. Use a fragrance-free moisturiser and protect exposed skin from irritation while it heals. Photograph the line in consistent lighting so you can describe change at review. Do not share or reuse someone else’s prescription. Depending on thickness and location, a clinician may suggest [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/); broader activity may lead to discussion of [Oral Corticosteroid Treatment](/treatments/medical-dermatology/oral-corticosteroid-therapy/).

Arrange a dermatology appointment for a new line of persistent bumps, a rapidly changing streak, or symptoms that spread beyond the original track. Seek prompt care if the area becomes hot, very painful, swollen, or produces pus. Mention recent injury, scratching, injections, tattoos, medicines, and any mouth, nail, or scalp symptoms, since these details help place the pattern in context.

Does the linear arrangement fit lichen planus? Could another rash or infection resemble it? Is a skin sample needed? Which treatment suits this location, and how should I watch for new areas or lasting colour change?