Sun exposure will cause [wrinkles later in life](https://image.slidesharecdn.com/cancerskincancer-130805154900-phpapp01/95/cancer-and-skin-cancer-lesson-powerpoint-dangers-of-tanning-uv-exposure-46-638.jpg?cb=1398588795). Also results in [keratosis](https://d9qc22597pyja.cloudfront.net/Pictures/2000x2000fit/9/3/7/1937_IMG_5877.jpeg) if you are very white which causes red blotches. It is very unpleasant to remove them with chemicals or liquid nitrogen and is pre-cancerous.