My son has had a fever for the past 2 days, and it broke today, but when he went to get in the bath, he complained that it hurt his bum, when I looked, I saw the skin on his perineum is bright red and chapped. I have put children's polysporin on it, but not sure what else to do. Do we need to see a doctor. Note he also has very very chapped lips at the moment too.