happy to help you
first of all quit this habit of yours .this is really a killer. yes there are some entities known as fordyce's granules that are not harmful but you can not be sure what that bump is!do not panic . please consult your general physician if not a dentist
he can also help you and get it diagnosed as soon as possible and please please spp dipping. it certainly leads to cancer.
hope it helps and wishing you best of your health and spirits