Hi. I am a bit worried because my 2 month old baby just had the second doses of his vaccines for DPT and OPV. After 3 days, we noticed that the injection site is a bit hardened and beside it is like a swollen one. It has a red circle on it and most likely a bit hard than usual. We went to his pedia and she told us to warm compress the site. Isnt it a cold compress? The injection site is warm, by the way. I am not really sure if it was an insect bite, but it is really there until now. The vaccine was injected last week.