Hi there. It does appear that you have some sort of bacterial infection in the form of an abscess, ecthyma
around your knee region. The other rash appears to be a hypersensitivity
reaction to the primary problem. Perhaps a course of antibiotics & antihistamines are the order of the day. You will require to see a doc for the prescriptions. I would be happy to recommend a dermatologist
in your area should you wish me to. Cheers & Good luck!
Dr Praveen Rodrigues MD Dermatologist & Cosmetologist, Vikram Hospital, Bangalore, India.