10yr old son has been unwell for the past 10 days, we think with the latest covid perhaps. Temp fluctuating between just elevated and a bit high, cough, lost appetite, no energy. He's felt better since Sunday and went back to school today. Enjoyed being back, full of beans and back to his normal self except his appetite hasn't come back yet. This evening he's come over with this rash. Mainly on his legs and bum but a bit on his lower back. Would you be concerned? I'm thinking it's a post viral thing, and this is the best he's been in almost a fortnight so I don't necessarily feel worried, but just hoping for opinions. Will be seeing how it is in the morning!