i had my first sex with a prostitute which was unprotected on 12th feb then after that i have been washing my penis with a soap to avoid STD but feeling having pain in abdominal pain on side of my back now its 1st March

don't know if it's a dry skin caused by a soap or STD
and i also got small two three bumps

please help me
Hi, i guess it is balanitis, nothing to be afraid of. and i am not doctor. i just shared my experience.