Hello. Its because of infection
. Take homoeopathic medicine:-
30 (3 drops tds for 5 days in one spoon water)
syrup (one spoon tds in half cup warm water for 5 days)
ferrum phosphoricum 6x (5 tablets tds for 5 days)
make a gap of 10 mins between each medicine.
Take steam with above medicine twice a day.
Take green tea or tusli and ginger tea. It will relief him.
is more he can take ferrum phosphoricum 6x two times more.
Update me after 5 days.