Facial Pain

Question 1

Differentials

Answer 1

TMJ Dysfunction
Sinusitis
Ramsey Hunt Syndrome
Trauma
Trigeminal  neuralgia
GCA/migraine/tension headache/cluster
Dental pain -abscess
Glaucoma
Peri/orbital cellulitis 
ENT malignancy (squamous cell)
Acoustic neuroma

Question 2

Investigations

Answer 2

Good history + examination 
Look in mouth, ears and nose
MRI/CT head
Temporal artery biopsy if suspect GCA
Fundoscopy
PCR - herpes zoster