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There are several types of "sun allergies," including polymorphous light eruption (PMLE), hives, and photoallergic reactions. Learn about these different reactions to sun exposure, as well as prevention and treatment.

Ticklishness falls into two categories: gargalesis (which produces laughter and squirming) and knismesis (the sensation of a feather brushing over the skin, also known as light-touch tickling). It is not clear why some people are ticklish, but it may be a bonding or protective reaction.

Women are more likely to get acne after age 20 than men. Unfortunately, treatment options that worked in the teenage years may not work as well in adult females. The emotional toll of acne may include a higher risk of developing depression, and having severe acne can negatively affect quality of life.

Nighttime skin itching can stem from dry skin, hormone changes, certain medications and skin care products, and rarely, a more serious illness. It can help to change bedding or pajamas, take short baths or showers, apply moisturizer liberally, and use a humidifier.

People can get sunburned even with sunscreen on, particularly if they use old sunscreen or certain drugs and skin care products that leave skin vulnerable. People should stay out of the sun at midday, wear a hat and sunglasses, and frequently apply sunscreen with SPF 30 or higher.

Frequent handwashing may lead to dry, cracked skin. Strategies such as lowering the water temperature and moisturizing with a heavy hand cream after washing can allow the skin to heal. Also try wearing cotton gloves over a thick moisturizer at night.

Hair loss is a common problem for many men and women, but what does it mean to have alopecia? Alopecia areata occurs when the body's immune system attacks hair follicles, resulting in hair loss. AA can affect the scalp, eyebrows, eyelashes, or anywhere hair grows on the body.

Rashes are a common side effect of many medications, and while they can be annoying, they typically run their course over a week or two. But not all drug rashes are mild — and some can even be deadly. How can you tell a serious rash from one that is just a nuisance?

Protecting the skin from the sun doesn't increase the risk of vitamin D deficiency or bone fracture, according to a recent study.