A 15-year-old girl complaining of moderate swelling of the left paroticmasticatory area is being examined by a dental surgeon. Palpation revealed the left parotid gland to be bulgy, dense, and painless. Turbid saliva is being secreted from the duct. The duct orifice is dilated, the surrounding mucosa is cyanotic, pastose, with teeth imprints. What disease is it?