Lichen planus on the lower legs

The lower legs may develop separate bumps or connected rough areas, sometimes on both sides. Scratching can break the surface and make the skin thicker, while healed inflammation can leave darker or lighter marks that do not represent ongoing infection. Swelling, scaling or soreness can point to another or additional problem, so a clinician should assess an unusual rash rather than relying on location alone. Lichen planus may also affect the mouth, nails or other skin sites.

Use a gentle cleanser, pat the legs dry and apply a fragrance-free moisturiser while the skin is still slightly damp. Avoid tight clothing and repeated rubbing over active patches. A dermatologist may prescribe a topical corticosteroid and explain whether it should be used on each patch or under a dressing. Oral corticosteroid treatment can be considered for more widespread inflammation, but it needs an individual prescription and follow-up. Do not scratch, pick scales or use strong products intended to lighten colour changes.

Seek assessment for a rash that is persistent, spreading, very itchy or changing in appearance. Get prompt care when the lower leg becomes hot, increasingly swollen, very painful, rapidly red or covered with drainage, or when fever accompanies a skin flare. Ask for review if sores do not heal or if symptoms affect walking, sleep or work.

Ask whether the lower-leg pattern is consistent with lichen planus, whether a biopsy is appropriate, and how to distinguish active rash from post-inflammatory colour change. Clarify the treatment area, application schedule, expected skin response and what to do if new lesions appear elsewhere.