Cellulitis is a skin infection caused by bacteria. It results in pain, swelling and discoloration to the area of infection on the skin. The discoloration, which can be red, purple or darker than the area of skin and looks like a rash, is caused by the toxins released from the bacteria. Flucloxacillin is a common treatment for cellulitis.
After a course of treatment has been completed and cellulitis symptoms have resolved, in some cases the rash or redness to the skin can remain. This is because it can sometimes take longer for it to go, even after the bacteria has been killed.
It is therefore important to seek advice about the rash or redness from your doctor. They will be able to access you and your symptoms. Then they can determine whether you still have an active infection or not.