Hi.. Can understand your concern.. As per your complain a small lump on the gums can be a canker sore or it can be due to some infection in the gum leading to formation of a small lump filled with pus.. It can also be due to irritation or injury to the gum by some hard food stuff or something like a toothpick.It can also be a cold sore caused herpes infection but it is mostly in the form of cluster and chances are less for it. Such a small lump is most commonly not anything serious and resolves itself without any medication What you should do is maintain a good oral hygeine.. Use antimicrobial mouthwash.. Drink plenty of water to maintain good hydration.. Most probably the lump will resolve itself in a week time.. But if it does not resolve or the size increases or if there is pain or the number of lumps increases you should consult a dentist.. Hope your query is solved.. Thanks and regards.. Dr.Honey Nandwani Arora.