FST-201 in the Treatment of Acute Otitis Externa

Inclusion Criteria: Study participants must: * Have a clinical diagnosis of AOE in one or both ears, defined as a clinical score of at least 1 for edema (0-3 scale), 2 for overall inflammation (0-3 scale) and 1 for tenderness (absent=0, present=1) * Be at least 18 years of age at Visit 1 (Day 1, Screening/Baseline) of either sex and any race Exclusion Criteria: Study participants must NOT: * Have known sensitivity to any component of the study medications * Have a current infection requiring systemic antimicrobial treatment * Have used topical or systemic pain meds on the same day as Screening/Baseline Visit 1 and for the duration of the study. * Take any systemic (within 30 days) or otic corticosteroids (within 1 days) prior to Screening/Baseline Visit 1 * Current use of topical or systemic non-steroidal or other anti-inflammatory drugs * Use any topical otic treatment with alcohol, vinegar, hydrogen peroxide or other astringent medication during the course of the study or on the same day as Screening/Baseline Visit 1 * Have taken any antibiotics within 3 days prior to Visit 1 * Have signs and symptoms of AOE for \> 4 weeks at Screening/Baseline Visit 1 * Have a clinical diagnosis of malignant otitis externa; * Have overt fungal AOE * Have a viral infection of the pinna or tympanic membrane (i.e herpes zoster) * Have congenital abnormalities of the external auditory canal in the enrolled ear(s) * Have obstructive bony exostoses in the enrolled ear(s); * Have mastoid or other suppurative, non-infectious ear disorders (e.g, cholesteatoma) * Have malignant tumors of the external auditory canal * Have a history of otologic surgery. Surgery performed more than 1 year prior to Screening/Baseline Visit 1and limited to the tympanic membrane is allowed * Have seborrheic dermatitis of the external auditory canal * Have a current or prior history of immunosuppressive disorders * Be pregnant, nursing or planning a pregnancy