You can protect your body in the sun by wearing long sleeves and a wide-brimmed hat. Use a sunscreen with a sun protection factor (SPF) of at least 30 and reapply often. Also look for one that is labeled "broad spectrum" so that it will protect you from both ultraviolet A (UVA) and ultraviolet B (UVB) radiation. Remember that even these measures won't completely protect you, so you should avoid being in the sun for a long period of time, especially during the sunniest part of the day. Talk to your dermatologist for more information.