A 28-year-old patient consulted a surgeon about pain, edema and hyperemia of the left side of his face, weakness, fever up to 39°C. These manifestations has been present for three days. Objectively: there is an inflammatory infiltrate of the left nasolabial fold 4x4 cm large with a necrotic core in the center, the pronounced edema of the left side of face, moderate nuchal rigidity. What treatment is needed?