This prospective, single-arm clinical study aims to evaluate the effects of a one-time, ultrasound-guided injection of corticosteroid (triamcinolone) combined with local anesthetic (bupivacaine) into the facial nerve in patients with acute Bell's palsy. The injection is administered approximately 1.5-2 cm after the nerve exits the stylomastoid foramen, with precise targeting using ultrasound imaging.

A total of 40 adult participants diagnosed within 72 hours of symptom onset will be enrolled. The primary outcome is improvement in facial nerve function, assessed using the House-Brackmann Facial Nerve Grading System at day 7, day 15, and 3 months post-injection. Secondary outcomes include changes in facial nerve thickness measured by ultrasound before and one week after the procedure.

This is the first clinical trial to directly evaluate targeted facial nerve injection as a potential treatment approach in Bell's palsy.

Inclusion Criteria

Age between 18 and 70 years

Diagnosis of acute Bell's palsy within the past 72 hours

House-Brackmann Grade III or higher

Willing and able to give informed consent

Able to attend all follow-up assessments

Exclusion Criteria:

History of chronic facial nerve disorders

Known allergies to corticosteroids or local anesthetics

Coagulopathy or current use of anticoagulant therapy

MRI or CT findings indicating alternative causes of facial nerve palsy (e.g., tumor, stroke, MS)

Pregnancy or breastfeeding

Participation in another interventional clinical trial

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