hi..Thanks for the query.
You haven't mentioned your age,but from the clinical picture given, feel what you might have may ,be acne vulgaris
or in simple terms pimples
.These often start out as whiteheads and later become pustular .Draining out of pus releives the symptoms ,but increases the chances of scarring.
Apply topical Clindamycin
gel twice daily on the area for 2-3 weeks.A topical Retinoid
may be added at night on alternate nights to start with .
Hope this helps.Take care!