What should you know about white vertical stripes on nails?

A pale line running from the cuticle towards the tip may reflect a small interruption in how the nail was formed. Picking, biting, manicures, pressure, or a knock can affect the nail near its root, and the mark then moves forward as the nail grows. Dry or fragile nails can also make ridges and pale areas more noticeable.

A stripe affecting one nail after local irritation is different from several nails developing new changes. Thickening, crumbling, lifting, surface pits, or colour spreading beyond a narrow line can point towards a nail disorder such as fungal infection or nail psoriasis. A photo and examination help distinguish changes in the nail plate from changes in the surrounding skin.

Keep nails trimmed, avoid scraping beneath them, and pause practices that repeatedly traumatise the nail surface. Use gloves for prolonged contact with water or cleaning products, and moisturise the nails and surrounding skin. Do not start an antifungal medicine solely because a stripe is white; treatment depends on the diagnosis, and a clinician may need to inspect or test the nail.

Take a clear photograph and note whether the stripe is moving towards the tip as the nail grows. Arrange a routine dermatology or primary-care review if the mark remains, returns, involves several nails, or comes with texture changes. More detail about nail colour changes is available under Discoloured Nails.

Seek prompt medical advice if the nail becomes painful, swollen, warm, or starts draining, or if it lifts quickly after an injury. Arrange an assessment soon when a new stripe is steadily widening, changes appearance, reaches the skin around the nail, or appears without an obvious cause. These features do not identify a diagnosis by themselves, but they should not be ignored.

Ask whether the pattern fits an injury or a nail condition, whether the nail should be tested, and which changes would require an earlier review. Tell the clinician about recent manicures, picking, trauma, skin rashes, itching, pain, or medicines, and show older photographs if you have them.