I get huge red patches on my body after a shower being in the sun even if my body's covered or any slight bit of heat and it goes away after about 30 minutes to 1 hour once out of heat I started getting it about 10 months ago sometimes and ever since that it just keeps getting worse I get it every day now and have to wear stockings every day at school because it's so embarrassing these patches are not raised at all but they feel very hot compered the bits that Aren't red and the feel a little bit itchy and have a slight burning feeling if anyone knows what this is please tell me I a would appreciate that a lot! Thanks.