A boy of 2 years and 3 months coughed for 3 weeks without fever. Please consult.

If this doesn't work, you can try this method: wipe the child's spine with ginger and wind oil, from the neck to the tail vertebrae, wipe the points behind the ear, then wipe the wrist, and then wipe the sides of the nose. My mother taught me this method, so every time my child coughs and can't take medicine, I will rub this for him, just once.