High homocysteine levels in the blood can damage the lining of the arteries. High levels may also make the blood clot more easily than it should. This can increase the risk of blood vessel blockages. A clot inside your blood vessel is called a thrombus. A thrombus can travel in the bloodstream. From there, it can get stuck in your:
Lungs (called a pulmonary embolism).
Brain (which can cause a stroke).
Heart (which can cause a heart attack).
Arrector pili muscle is the one with hair follicles that has a smooth muscle which is in an unconscious control rather than conscious control. This pull up the follicle causing the goose bumps then. Hope this is the right answer and will be of big help then.
The three best ways to reduce exposure to UV radiation is usually to wear sunscreen beyond a certain SPF. Additionally wearing clothes that cover as much skin as possible usually reduces exposure chances. Or lastly.... You could just stay inside.
There are benefits however to having some sunlight exposure. Vitamin D which a very important Vitamin for bone health can be supplemented by being out in the sun. Additionally you would also developer a skin tone that would look better instead of being deathly white.... Which actually also improves your Vitamin D absorption.