Over the past few days, a spot/bite on my 8 year old has got worse and has redness around it that has today got noticeably larger. Been using some fusidin that we had from a while ago but it isn't helping. Annoyingly I didn't check it this morning and have only just checked it at bedtime and it is much worse than yesterday. How urgent is it to get these things checked out and medicated? She is fine in herself atm but with the redness spreading I am worried about cellulitis.