How to lighten knees, elbows and armpits?

Knees and elbows commonly face pressure and roughness, while armpits may react to shaving, deodorant, sweat or tight clothing. Inflammation from any of these triggers can leave darker pigment after the rash has improved. Armpit skin is also more sensitive, so a product tolerated on an elbow may sting there. Dark, thickened skin in several folds can have causes that need medical assessment rather than cosmetic care alone.

Wash gently, pat dry and apply a fragrance-free moisturiser to knees and elbows. Avoid scrubbing, bleaching mixtures and applying acids immediately after shaving. Choose a deodorant that does not sting, allow the armpit skin to recover after hair removal, and wear breathable clothing. Use sun protection on exposed joints. A dermatologist can decide whether a topical retinoid or chemical peel belongs in the plan and whether each area needs a different approach.

Arrange care if the colour change is sudden, spreading, thick or velvety, or if it comes with itch, rash, pain, odour, discharge, cracking or sores. Underarm darkening with persistent irritation may need treatment for the underlying dermatitis. Stop a product and seek advice for swelling, blistering or strong burning. Assessment is particularly useful when several body folds change together.

Do my knees, elbows and armpits have the same cause? Could shaving or deodorant be contributing? Which treatment is safe for the more sensitive underarm skin?