The best known types of ultraviolet sunlight are UVA and UVB. Too much exposure to either of these rays will damage your skin. Not only will overexposure cause wrinkles and brown spots, prematurely aging the skin, but it can also have far more serious consequences such as skin cancer.

The effects of sunburn and sunstroke are unpleasant - as anyone who has experienced it will know. Short term exposure may result in painful burning and reddened and peeling skin. Sunstroke is more serious: it dehydrates the sufferer and can cause high temperatures, vomiting and headaches.

But the most devastating side effect is undoubtedly skin cancer. It is estimated that 90% of non-melanoma skin cancers and 60% of melanoma skin cancers (the more serious form) are caused by over exposure to the sun. Worryingly, melanomas are not just caused by prolonged and consistent over exposure: any episodes of sunburn, no matter how infrequent, also increase the risk due to the damage this does to your skin cells.

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Dark circles are formed under the eyes. They are dark blemishes that surround the eyes and thus spoil the appearance of the face. They are also known as eye circles and are sometimes referred to in slang as bags under the eyes.

There are many reasons why dark circles may occur. Knowing these reasons will help to avoid them and thus get protection from these ungainly blemishes on the face. These causes are:

1. Lack of sleep
2. Extreme tiredness
3. Improper diet and nutrition
4. Stress
5. Hormonal problems
6. Advancing age
7. Hyper-pigmentation of the skin
8. Exposure to heat and sunlight
9. Excessive intake of some drugs

Dark circles are caused due to vitiation in the vata and the pitta doshas. These are the elements governing the air and the fire elements in the human body respectively. It has been found that yoga is very beneficial in reducing dark circles. Pranayama and shavasana help the mind to de-stress. Such asanas are prescribed for people with dark circles.

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