A: Sunlight has been known to cause short term improvement, however studies have shown that sunlight worsens acne long-term, due to UV damage. Its recommended that anyone suffering from acne take extra precautions such as high SPF sun block when spending time in the Sun.
UVA radiation damage is cumulative; signs of damage may not appear for years, but eventually the results of the damage you have done to your skin throughout your lifetime will show up as age spots, wrinkles, and sagginess.
UVB rays are responsible for causing sunburn, freckles, liver spots, and other surface damage to the skin. They are the greatest culprits in causing skin cancers and are responsible for contributing to cataracts and other eye damage.
In conclusion the risk of sunbathing will suffering from acne outweigh any potential benefits.