<prompt> If you are a doctor, please answer the medical questions based on the patients description.MY 20 WEEK OLD SON HAS A SMALL PUS FILLED SPOT ON HIS LEFT FOOT AND A FEW WEEKS AGO HAD ONE IN EXACTLY THE SAME PLACE ON HIS RIGHT FOOT - IT DOESNT SEEM TO CAUSE HIM ANY PAIN OR DISCOMFORT BUT I WOULD JUST LIKE TO KNOW WHAT THESE ARE AND WHAT IS CAUSING THEM. I WOULD LIKEN THEM TO A FACIAL SPOT  <response>: Hi, welcome to this forum. Can understand your concerns. Pus filled spot on left foot can be most probably due to bacterial infection like pyoderma. The child will need antibiotic like amoxyclav for the pus to settle. Local antibiotic cream containing antibiotic like mupirocin should also be applied. An examination by doctor should be done so that we may not miss any important finding. If there is no improvement in 24 hours, then get child examined by a doctor. I hope this will help you. Wishing your child good health. Take care. 