1. It is quite likely you have sensitive skin that is allergic to one or more of the ingredients in the sun-block. Start by removing the sunscreen using water and a mild soap that has specifically been designed for those with sensitive skin.
2. Following the instructions on the pack, apply some hydro-cortisone cream 1 per cent on the affected area. Make sure to follow the guidelines and only apply a small amount of the cream on your skin.
3. Alternatively you could apply some acne medication or creams that are available over the counter from most drug stores. Ask your pharmacist for creams or products containing salicylic acid or benzoyl peroxide. This could then be used to treat the affected area of the skin.
4. If you find these steps do not improve your skin, visit your doctor or dermatologist for more advice as the irritation may actually have been caused by something other than the sun-block.
If you find your skin reacts with sun-block regularly, buy a fragrance-free sun cream specifically designed for sensitive skins. Those with oily or acne prone skin should look for products that are oil-free or labelled as non-comedogenic. It may always be a good idea to sample the product on a small part of your skin and waiting for 24 hours to see if your skin reacts to it before applying it all over.