The sunlight has three kinds of ultraviolet lights: UVA, UVB, and UVC. UVC is the most dangerous, but it is filtered by the ozone layer; UVA and UVB can go through the ozone layer and may have harmful effects on skin.
Long exposure to the sun may cause sunstroke and skin cancer. Sunstroke is characterized by rashes, tiredness, headache, fever and dehydration. Skin cancer can be detected through the change of color and shape of beauty spot, or ulcers on parts of the skin that are often exposed to the sun. Long exposure to the sun may cause skin pigment disorders and early aging.
Hormone and certain anti-biotic therapies can make the skin sensitive or allergic to the sunlight. Sunlight can initially help treat pimples, but it can create favorable conditions for pimple eruption later. A cold climate can affect the blood circulation, giving rise to partial lack of blood that damages the skin and tips of limbs. It can dehydrate the skin, damaging the outer layer of the skin and making it easy to be attacked by harmful elements. Cold climate makes the skin dry or even cracked, especially the lips.
The skin can be severely damaged by pollution caused by sulfurous oxide, carbon dioxide, nitrogen monoxide, nitrogen dioxide, ozone, hydrocarbon and lead. Skin ages over the passage of time can be clearly seen by the fifties. But if the skin is often exposed to the sun or fierce weather, it will age faster. For women in their menopause, usually from the age of 45, the flow of progesterone and estrogen becomes irregular, causing dry or oily skin, pimples, and even some hair on the face.
Smoking also leads to early skin aging, characterized by wrinkles, especially at the eyes’ corners. A recent study has showed a relationship between the numbers of wrinkles at the corners of the eyes and the number of cigarettes one smoked. The situation is worse for those who have to work outdoors. Nicotine has been shown to retard the healing of wounds on the skin. These risks are worse for female smokers undertaking hormone therapies for contraception.
Skin disorders also occur in pregnant women. There will be brown spots on cheeks and forehead because of light, because of increase in progesterone and estrogen, and the faster blood circulation. Pimples often appear at the beginning of pregnancy and disappear at the end. Pregnant women will suffer from skin stretch due to gaining weight quickly in a short time. They should use skin-nourishing cream. Most of the disorders will disappear after giving birth. Expectant mothers should protect their skin when going out.
Stress can have a bad impact on the skin, characterized by rashes, hair loss, hand perspiration, pimples or certain kin diseases. Some medicines can have side effects, mostly rashes. Avoid the sun while taking some kinds of drugs-follow your doctor’s advice. Some medicines may cause signs of an allergy, so remember to inform them to your doctor.