If your skin is red, sore and warm to the touch and often itchy from sun exposure, it is important to give it some TLC and look after it. As said, ensure skin does not become damaged further by staying away from the sun and wearing sun lotion. Try to cool skin by using a cold compress or a cool bath or shower.
Drink lots of water to replenish the fluids in your body and help to cool you down. The skin will probably be very tender and dry, so apply a layer of after sun product, such as NIVEA After Sun Moisture Moisturising Soothing Lotion to the affected areas to help further cool the area and replace any moisture lost, after sun won't protect your from the long term damage from sun exposure though. This should help cool the skin, providing moisture to dry areas and leave skin feeling more comfortable. Be very gentle when applying any product to the affected area and use a dabbing motion rather than rubbing to treat the sunburn. If over exposed skin shows no signs of healing or relief within a week, it is best to seek professional medical assistance.