Assalamo alaikum, i know that is mandatory to shave the hair on our private parts regularly but whenever i shave i get little bumps or ingrown hair and sometimes both , is it permissible to trim in this situation? as whenever i try trimming it is fine, if not do i still have to shave it completely?

Ustadh AbdulAziz al-Haqqan

Yes, trimming is enough. I advise to seek out medical help before you do anything.