A 53-year-old woman complains of a painful swelling in her left parotid area. The swelling appeared 3 days ago. Objectively, the skin in this area is slightly hyperemic and tender. The excretory duct of the salivary gland produces a small amount of viscous turbid yellow-green liquid. Microscopy detects a diffuse infiltration of the gland with segmented neutrophils. Make the diagnosis: