What is the likely diagnosis and recommended management for a unilateral burning sensation of the right periorbital, cheek, nasal, and upper‑lip region?

Unilateral Burning Facial Pain: Likely Diagnosis and Management

Based on your description of continuous burning sensation affecting the right periorbital region, cheek, nose, and upper lip, you most likely have post-traumatic trigeminal neuropathic pain, post-herpetic neuralgia (if preceded by a rash), or post-viral trigeminal neuropathy—all of which require neuropathic pain medications as first-line treatment.

Differential Diagnosis Algorithm

Your unilateral burning facial pain pattern points to several key possibilities that must be systematically ruled in or out:

Primary Considerations:

1. Post-Traumatic Trigeminal Neuropathic Pain 1

• Key features to confirm: History of recent dental procedures (root canal, extraction, implant), facial trauma, or surgery within 3-6 months
• Continuous burning, tingling pain in the maxillary (V2) distribution
• May have allodynia (pain from light touch) or altered sensation
• Often starts with poor analgesia during the triggering procedure

2. Post-Herpetic Neuralgia (PHN) 1

• Critical question: Did you have a painful rash with blisters in this exact area 1-3 months ago?
• Continuous burning, tingling, itchy, tender quality
• Moderate to severe intensity
• Allodynia and hyperalgesia common
• Light touch and eating may aggravate

3. Post-Viral Trigeminal Neuropathy 2, 3

• Key history: Recent upper respiratory infection, COVID-19, or flu-like illness
• Emerging recognition of cranial nerve involvement after viral infections
• Paresthesia with burning quality in infraorbital/maxillary nerve distribution
• No structural abnormalities on imaging

Must-Rule-Out Emergencies:

Giant Cell Arteritis (if you are over 50 years old) 1

• This can cause blindness and requires immediate treatment
• Temporal region pain, jaw claudication (pain with chewing)
• Visual changes, scalp tenderness, fever, malaise
• Action required: Urgent ESR and C-reactive protein blood tests, temporal artery biopsy
• Treatment: High-dose corticosteroids (minimum 40 mg daily) within 2 weeks

Less Likely Given Your Presentation:

Trigeminal Neuralgia 1

• Why this is unlikely: Your pain is continuous burning, not paroxysmal electric shocks
• Classic TN: Sharp, shooting, electric shock-like attacks lasting 2 seconds to 2 minutes
• Triggered by light touch, washing, cold wind, eating, brushing teeth
• Has refractory periods between attacks
• Your continuous burning pattern does NOT fit this diagnosis

SUNA/SUNCT (Trigeminal Autonomic Cephalgias) 1

• Why this is unlikely: No mention of autonomic features
• Would have: tearing, red eye, nasal congestion/rhinorrhea, facial sweating
• Rapid attacks lasting seconds to minutes, up to 200 daily
• No refractory period between attacks

Recommended Management Pathway

Immediate Steps:

1. Exclude red flags:

   • If over 50: Check ESR, C-reactive protein urgently to rule out giant cell arteritis
   • Look for any history of recent rash (herpes zoster)
   • Review recent dental work or facial trauma history
   • Consider recent viral illness (COVID-19, URI)

2. Diagnostic workup:

   • MRI brain to exclude structural lesions, tumors, multiple sclerosis 1
   • CT sinuses if sinus pathology suspected 3
   • Qualitative sensory testing to document sensory changes 1

First-Line Treatment (Neuropathic Pain Medications):

For Post-Traumatic/Post-Viral/Post-Herpetic Neuropathic Pain 1:

The evidence supports starting with standard neuropathic pain medications:

• Gabapentin or Pregabalin (anticonvulsants with evidence in trigeminal neuropathy) 1
• Tricyclic antidepressants (amitriptyline) for burning quality pain 1
• Carbamazepine or oxcarbazepine are NOT appropriate here—these are for trigeminal neuralgia with electric shock pain, not continuous burning 1

Important Clinical Pitfalls:

⚠️ Common mistake: Treating continuous burning facial pain with carbamazepine because it's "trigeminal pain"—this only works for classic trigeminal neuralgia with paroxysmal electric shock attacks, not neuropathic burning pain 1

⚠️ High failure rate warning: Post-traumatic and post-dental trigeminal neuropathic pain has a notably high percentage of treatment failures 1, so early referral to pain medicine or neurology is appropriate

⚠️ Don't miss: In patients over 50 with new-onset unilateral facial pain, giant cell arteritis MUST be excluded immediately to prevent blindness 1

Prognosis Considerations:

• Post-viral neuropathy may improve over months but requires multidisciplinary evaluation 2
• Post-traumatic trigeminal neuropathy often has poor response to standard treatments 1
• Post-herpetic neuralgia can be chronic and severe, requiring aggressive neuropathic pain management 1

When to Refer:

• Pain medicine specialist: If first-line neuropathic medications fail
• Neurology: For diagnostic confirmation and MRI interpretation
• ENT: If sinus pathology suspected
• Dentistry: If dental trauma or procedure preceded symptoms

The key distinction is that your continuous burning quality indicates neuropathic pain requiring anticonvulsants or tricyclic antidepressants, NOT the paroxysmal electric shock pain of trigeminal neuralgia that would respond to carbamazepine.