My son has developed a rash yestrday. It was 3-4 raised bumps at first ..pinkish and itchy .he scratched it saying it's itchy and when I checked today it has becom big and patch kind. He is still scratching and slight swelling is there in that area. Can you please suggest which ointment can we apply and wht could this be. 1) is it some kind of dust allergy or insect bite? 2) could this be any sign of viral( covid) or petireasis rosea related rash( he had it last year around this month ) and we used som ointment n reduced on its own in a week or two. Please suggest some medicine/ cream. Can we apply caladryl to sooth it.