<s>[INST] my son has a pimple with a head underneath his arm pit area a little up top of the hair area only 11 years old popped it white pus came out and does not move from the area sticks on notice also has another pimple bump on his left side too below nipple area? Is this some concern? [/INST] Hi,From history it seems that there might be having ingrowm hair follicle  infection at both the sites giving this problem.Clean the part and apply antibiotic cream.If require give him one course of antibiotic medicine like Amoxicilin for 3-5 days.Ok and take care. </s>