Hi doc, two hours ago 6 pm, my skin (whole body) developed rash, all of a sudden. Please note I have never got such severe rash before and I have recently received covisheild vaccine 3 days back, its not itching much, but slight itch and a lot of red patches all over my body. I am unmarried male 32, single and also virgin. What could be the cause of rash all of a sudden. Please advice at your earliest. Thanks!