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Ringworm is a common, contagious skin infection caused by a fungus. Children can get it from other people who have it or from an infected animal. While it can be itchy and unpleasant, ringworm is usually harmless.

Sun-protective clothes are made of materials that shield your skin from harmful ultraviolet (UV) rays. The most effective fabrics for the job have high thread counts, are tightly woven, and are dark or bright colors (which absorb light). Examples include polyester, nylon, lightweight wool, or canvas. Many clothing manufacturers now use high-tech fabrics for sun-protective garments. Some wick away moisture and dry quickly. Some are embedded with chemicals used in sunscreens (such as zinc oxide and titanium dioxide). High-tech fabrics offer at least as much protection as regular densely woven fabrics, and maybe more.

Warts are an unsightly nuisance that can take a year or more to go away on their own. Several effective, noninvasive treatments are available.

Swimming is a great activity for children, but for children with the allergic skin condition known as eczema, swimming can be complicated. Taking steps to protect skin before and after a swim can help.

As people age, earlier sun damage to the skin, especially on the face and neck, shows up as dry skin, wrinkles, and age spots. While much of this sun damage occurred in the past, people can take steps later to reverse some of it. Adopting a three-step daily skin care routine—washing, moisturizing, and applying sunscreen—is the best way to treat existing skin problems, maintain healthy skin, and protect against future harm.

Nail-biting can introduce germs into people's mouths that can cause a range of illnesses, including colds or salmonella. The habit also creates tiny fissures in skin that can become infected. People who bite their nails should occupy their mouth and hands with other tasks.

Celebrities and influencers claim that consuming collagen could have miraculous benefits for skin, hair, and nails. But what does the science say?

The most common non-melanoma skin cancers are basal cell carcinomas and squamous cell carcinomas. They aren’t usually life-threatening, but they can be quite dangerous. They can bleed, hurt, and eat away at skin. If left untreated, they can erode through important structures like the nose, eyes, bones, or muscles. If they become very large, they can spread, and in rare cases cause death. Treatment ranges from scraping out skin cancers with surgical tools to Mohs surgery, a procedure that spares as much healthy skin as possible.

Hives are red, itchy welts that crop up on the skin. Allergic reactions and stress, among other triggers, can cause episodes of hives, which typically last several days to a couple of weeks. Cases that last six weeks or longer may be autoimmune hives.

Melasma, which causes dark patches on the face, is far more prevalent in women than in men. Dubbed the "mask of pregnancy," melasma triggers include not only pregnancy but also hormonal fluctuations, genetics, and sun exposure. People with darker skin are more prone to it. Melasma is typically treated with topical products that lighten the skin or slough off cells. Laser treatments and chemical peels, however, may worsen melasma. Sunscreen use can help prevent flares.