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Painful bumps which look like pimples over the face could be a lot of things. It could be boils
cysts, periporitis etc. As you are getting more new lesions and as mupirocin
which is an antibiotic is not helping you it is better to show a dermatologist
for accurate diagnosis. You may continue mupirocin till you get an appointment and wash your face with a mild face wash twice daily like cetaphil
cleanser for sensitive skin . It is better to avoid any greasy creams on your face and too much sunlight.
Hope this helped