Cellulitis?

[Monkeymonster]

DC has had a sore foot / toe for a few days. This morning, said it was really painful. Gone off on a school trip for the day, but now google has got me concerned that this might be cellulitis. Does anyone have any experience?

Image just uploading

If it's hot and the redness continues to spread, get it seen to. Obviously you can't do that until she/he gets back from the trip but at least you have a photo to compare it against.

If it looks the same, draw around the redness so you can see is it spreading overnight.