A 22-year-old patient complains of a painful swelling in the right parotid gland region. A week before the pati- ent got a cheek abrasion which was healing under the purulent crust. Over the past two days, the patient had had progressing pain and fever up to 38,6°C. Objectively: there is a soft tissue edema in the right parotid region, the skin is slightly tense but has not changed in colour. There is a dense painful infiltration 2,5x3,5 cm large, the overlying skin exhibits limited mobility. The mouth can be fully opened, the mucous membrane around the orifice of the salivary duct is unchanged, the saliva is transparent. What is the most likely diagnosis?