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Sunscreens can cause irritant contact dermatitis, allergic contact dermatitis and also photo-allergic contact dermatitis in some people. Photo-allergic dermatitis differs from allergic contact dermatitis, as the rash occurs only after the skin comes into direct exposure with the combination of the allergic substance (in this case the sunscreen ingredients) and sunlight. Some people are allergic to the chemical ingredient Para-aminobenzoic acid (PABA), so many sunscreens are now PABA free. If you suspect that you have a sunscreen allergy you should consult a dermatologist for a skin patch test. After the patch test, they should be able to advise you on the type of sunscreen that you can use and which to avoid. Sunscreens can also "go-off", so it is recommended to not use out-of-date sunscreens left over from previous holidays as they lose their effectiveness at protecting you from the UV radiation. Most sunscreen packaging will carry a "use by" date.