Hi..
Can understand your concern..
As per your complain as your son had got trauma to his teeth there are chances that there can be
fracture in the crown or root portion of the tooth leading to bacteria invading the Pulp (central portion of tooth containing nerves and blood vessels) causing infection and inflammation of the pulp and it has progressed to the area below the root tips leading to pus formation and the condition is known as "DENTAL ABSCESS" and the swelling is due to pus accumulation in the soft tissues..
The pus when has no escape way causes pain due to pressure on the nerve fibers in that area..
I would suggest you to consult emergency rooms and get him examined and medication should be started (antibiotics and painkillers)..
When you
consult a dentist get an
x Ray done and in case. If any fracture is observed in the crown portion of tooth
Root canal treatment and capping can help..
In case of root
fractures mostly extraction is indicated..
A pimple like thing on
upper lip can be from bacteria infection and it will get healed itself..
It can also be due to viral infection (herpe)but confirmation and treatment can be planned only after clinical examination..
Hope this information helps..
Thanks and regards..
Dr.Honey Nandwani Arora..