Nail basics
A fingernail is made of keratin, the same type of protein found in hair and the outer layer of skin. The visible nail plate is not alive. It is produced by cells at the nail matrix, which sits under the skin at the base of the nail. Fingernails typically grow slowly, taking several months to replace completely, and toenails grow more slowly still. Because growth is slow, damage to the base can show up in the nail weeks later.
What cuticles are
The word cuticle is used in two ways. The true cuticle is a thin, clear layer of tissue attached to the nail plate where it emerges from the skin. The skin fold around the nail, sometimes called the eponychium, is the living skin it grows from. In everyday speech, people usually mean both.
Their role is protective. Together they form a seal between the nail and the finger, helping keep out water, germs and irritants. When that seal is broken by cutting, tearing or aggressive pushing, the area can become sore, red and prone to infection around the nail.
Habits that protect the nail area
- Leave the seal alone. Many nail professionals and health sources generally advise against cutting the cuticle. Trimming loose, hanging skin (a hangnail) with clean, sharp tools is different from cutting the cuticle itself.
- Be gentle if you push back. After a shower, when the area is soft, some people gently ease the skin back with a soft tool. Pressing hard or scraping at the nail surface can damage the matrix and cause ridges or dents.
- Moisturize the area. Rub hand cream, or a small amount of oil or ointment, around the nails. This is often the most helpful habit of all, and it can be done while watching TV or before bed.
- Do not tear hangnails. Pulling them can rip live skin. Clip them cleanly instead.
- Avoid biting and picking. Biting nails or picking the skin around them breaks the skin and can introduce germs. Habits like these can be hard to stop, and strategies such as keeping nails short or wearing gloves may help.
- Limit wet work. Repeated soaking softens nails and skin, and then drying leaves them brittle. Wearing waterproof gloves with cotton liners for dishes or cleaning often helps. The same thinking applies to dry, cracked hands more generally.
- Trim nails regularly with clean tools. Cut fingernails straight across or in a gentle curve, and file rough edges in one direction.
- Cut toenails straight across rather than curving into the corners, since curved cuts may contribute to ingrown toenails.
Manicures, polish and products
Nail products can be perfectly fine, but a few points are worth knowing.
- Clean tools matter. At a salon, sharing tools that have not been sterilized can spread infections. It is reasonable to ask how tools are cleaned, or to bring your own.
- Polish removers can dry nails. Acetone is a strong solvent and can leave nails and surrounding skin dry. Using remover only when needed, and applying cream afterward, may help.
- Gel and acrylic systems. These can be hard on nails if applied or removed roughly. Peeling off gel polish can pull away layers of nail, and many people prefer to follow removal instructions or have it done professionally. UV lamps are used to cure gel polish, which is one reason some people apply sun protection to the hands, as with daily sunscreen on exposed skin.
- Reactions. Nail products can occasionally cause allergic contact dermatitis, often appearing on the eyelids, neck or face (places touched by the hands) as well as around the nails. If a rash appears after a manicure, it may be worth reviewing the product. Patch testing is something a doctor can arrange if the cause is unclear.
- Hardeners and strengtheners. Claims vary, and some can make nails brittle. Treat marketing statements with caution.
Nail changes and what affects them
Occasional white spots, faint ridges running lengthwise and minor splitting are common and often tied to everyday wear, age or minor injury. Brittle or peeling nails are often related to repeated wetting and drying and may improve with moisturizing and glove use. Nutrition and general health can also influence nails, but changes in the nail are rarely a reliable sign of a specific deficiency, so avoid self-diagnosing from the nail alone.
When to ask for advice
See a doctor, dermatologist or other qualified health professional if you notice:
- Redness, swelling, warmth or pus around a nail, particularly if painful or spreading
- A nail that becomes thick, discolored, crumbly or lifts from the nail bed, which could be a fungal infection or another condition
- A dark streak or spot under a nail, especially if it is new, widening, changing or not linked to an injury, since this should be checked promptly
- Significant pits, grooves, or changes across several nails
- A nail growing into the skin and causing pain
- Persistent pain, or a nail injury that bleeds under the nail
In people with diabetes or poor circulation, even small problems around the nails deserve prompt attention. This is general information, not medical advice, and individual circumstances vary.