Most bruises form when small blood vessels (capillaries) near the skin's surface are broken by the impact of a blow or injury — often on the arms or legs. When this happens, blood leaks out of the vessels and initially appears as a black-and-blue mark. Eventually your body reabsorbs the blood, and the mark disappears.
Generally, harder blows cause larger bruises. However, if you bruise easily, a minor bump — one you might not even notice — can result in a substantial bruise.
Some people — especially women — are more prone to bruising than others. As you get older, your skin also becomes thinner and loses some of the protective fatty layer that helps cushion your blood vessels from injury.
Sunscreens are designed to remain at original strength for up to three years. This means that you can use leftover sunscreen from one year to the next. Some sunscreens include an expiration date — a date indicating when they're no longer effective. Discard sunscreen that is past its expiration date. If...Read More
Is setting down your iPad the last thing you do before bed? New research shows that all of those nighttime hours spent with your tablet can wreak havoc on your sleep. The bright light emitted from these tablets can suppress melatonin. That's a hormone that helps control sleep and wake cycles, called circadian rhythms. The researchers...Read More
You’ve heard the adage: Shaving your legs makes hair grow in thicker and darker. But is it true? No, says Tulane University dermatologist Ron Davis, MD. Your hair grows in follicles beneath the skin, and nothing you do to your leg hair on top of the skin can change its diameter...Read More