If I accidentally scratch and pop a pimple, is it better to leave it as it is or to get rid the rest of it cleanly?

Hi,

For the best outcome, it may be best that you consult a doctor and treat the affected area with an antiseptic or antibiotic gel to prevent worsening of the skin inflammation which in turn leaves more significant scarring.

Physical removal of residual pus is rarely indicated and may aggravate the situation unexpectedly.