Uncommon but not rare, allergic reactions to sunscreen ingredients can happen, and I have a child that is allergic to some ingredient in sunscreen. His face breaks out in a rash. We are trying some with alternate ingredients to see which one doesn't have whatever he is allergic to. Some children have been reported as having severe allergic reactions with large hives and blistered rashes.
"Over the past 20 years, the dangers of sun exposure have been recognized, from sun-damaged skin to skin cancer. As a result, the use of sunscreens has become a routine part of our daily lives. This has led to various allergic reactions to the chemicals found in sunscreens. Most of these allergic reactions represent contact dermatitis."