My 12 year old daughter has a 1cm white bump on her gum.  Tender to touch.  She squeezed it and a yellowish puss came out.  It does not hurt now.  She has one at a time but has had several over the past few weeks.  My son who is 9 has started getting them.  They both had strep recently which I am not sure if it has anything to do with it.
Hi, Thanks for asking query, The bump on her gum may be due to gingival abscess, which mainly occur due to improper oral hygiene and food lodgment. I suggest you to go to the doctor and get the scaling done, maintain good oral hygiene, brush twice daily, use the antiseptic mouthwash twice daily. Your son also seems to have similar problem, use same treatment advice for him and keep the check on there eating habits also.