Unexplained twitch and tongue lesions can be due to deficiency of potassium, calcium, sodium, magnesium, vitamin B complex, or vitamins B1, B3, or B6
and Vitamin D. Get your son’s kidney function, parathyroid gland function
and adrenal function tests done and serum levels of the above mentioned nutrients checked.
The best thing would be to consult a general practitioner or PCP and try and assess what is the cause of your problem.