My daughter (9) has a bite or rash on her knee that has been there for about two weeks and appears to be getting worse not better. It started off looking like a single red spot but has developed into something bigger. It’s not sore but is very itchy. It’s not hot around the edges but the skin in the centre is yellow-ish with the red raised section around the edges. Pharmacist has given antihistamine and itch cream. Any ideas what it could be?