Pimple or something worse?

Before I get called out.. I went today to the doc and had a Pap smear and everything and told the doc about this “pimple” fast forward it popped regularly and 3-4 days later it formed as a flat surface and it’s painful when I touched it.. he said it shouldn’t be herpes or anything contagious and prescribe me clindamycin gel… but I tried to pop it( I know it’s not good) but it wouldn’t pop and it would bleed and hurts… it’s flat.. I’m worried bc it’s been about 10 days please kind responses…