Tis the season for sun-related skin problems. As we all know, it is important to use sunscreen to prevent skin damage and skin cancer, but sometimes we can create new problems by applying sunscreen.
The article below explains some of the common problems with sunscreens. Multiple ingredients of cosmetics can lead to an allergic reaction. Most of them represent a delayed reaction (2 days later). Usually the pattern of the rash is in the sun-exposed areas, but can be everywhere on the body. If you or a loved one experiences a rash which may be due to sunscreen or cosmetics, it may be advisable to get patch testing done to determine which chemical to avoid.
Article: Sunscreen Allergy (About.com)