My eight year old grandson has an infection on the Tragus part of the external ear. He was starting with cellulitis and put on oral antibiotics. It got worse and an ENT specialist made a cut for drainage. The tragus is now very red and starting to crust. is it getting better or worse? Does he need an I VE antibiotics? Should a culture be taken as to if it is bacteria or virus? Impetigo was mentioned not confirmed.