I think you should consult an ENT specialist for your sore throat.
But regarding the boil on your cheek, your dentist might be able to diagnose the problem if he has got that level of expertise.
Next Steps
Even though the boil is not paining, just make your dentist to investigate and rule out any possibilities of any potential pathology before It worsens.
Health Tips
Try consulting an oral pathologist instead of a general dentist.