How do you screen for skin cancer, is it important to screen for skin cancer?

Dermatologist & yes. Those at risk should, it includes fair (light colored, freckled) skinned individuals. Sun damaged skin and those with nevi and moles. The main way is to look at all the skin and look at lesions and moles by a specialist, the dermatologist. The patient should also keep an eye on lesions, enlarging or growing, asymmetry, color changes, bleeding, larger than a pencil eraser should be checked.
Yes. Skin cancer screening involves your physician or dermatology going over your entire body looking for suspicious lesion. Areas of concern are biopsied. A large study from germany recently demonstrated that routine skin cancer screening reduced melanoma mortality rates.
Look in the mirror! Look for enlarging lesions. There are many skin cancers, but if you any bumps which are enlarging or changing with time, have them checked out. Melanoma risk goes up if a lesion is (abcd): asymmetric, has irregular borders, has different colors, and diameter >6mm. If in doubt, get it checked out.

Related Questions

Is it possible for sun screen to actually increase the possibility of getting skin cancer?

No. Unlikely and would be unusual. The protection from the sun far outweighs any potential risk, and there are none that we know of. Read more...
None known. There is no evidence at present that sunscreen use can increase skin cancer risk. As a "possibility", there is always a chance that some new chemical could cause skin cancers due to toxicity many years after use, although this would be surprising. Read more...

Does washing your hands 30 times during the day cause cancer? Also does leaning over your computer screen cause skin cancer?

No to both. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex. Read more...