My son is 2 years old and 8 months. i spotted a white spot in his gum under one of his front incisor teeth. it doesnt look like an abscess or ulcer. im just wondering what could it be. hes not in pain either?

There may be a small calcification on the gum. It is best to not irritate the area. Use good dental care and a Pediatric Dentist evaluate. Annual dental examinations are recommended. Watch for signs of redness, swelling and drainage.

There are textbooks full of things that it could be, and providing a list without doing an examination would be counter-productive if not dangerous. Most are benign, a few are not. Your son should already be under the care of a Dentist since his 1st b'day, preferably a specialist Pediatric Dentist. Please have him examined by a competent professional. And the sooner the better.