irritated skin

I was cleaning my boy's cage today and I noticed my Charlie's ears are redder than usual. Also more irritated and less fluffy than usual. Does anyone know why this could be the case? Is there anything I should do immediately? I've contacted my Vet and I'm awaiting their reply too. Thanks for...

*I’ve got a vet appt in a few days anyways but still wanted some opinions!* does this look like the beginning of bumble foot or something else? guinea pigs feet look red & irritated! back paws have red irritated patch towards the ‘heel’ of paws & the front paws are really quite swollen and a...