Hello, Welcome to healthcare magic. From your description, the possibilities could be eczema with secondary infection, insect bite reaction or folliculitis. It is important to make a right diagnosis first. If there is a severe infection with pus discharge, you can take a course of oral antibiotics instead of applying a cream containing steroid - antibiotic combination. A steroid , especially a potent one can worsen infections. Hence you need to treat the infection first and then apply the steroid based on what diagnosis your doctor makes. As far as your query of MRSA is concerned, the only way to confirm is by sending the pus swab for culture and sensitivity testing. The symptoms per se will not give a clue about the underlying organism. Hope this answers your query. Take care.