Several lymph nodes reside within the parotid gland as a superficial and deep group of nodes. These nodes may be involved with any process that affects lymph nodes, including bacterial, fungal, viral, and neoplastic processes. Rarely, drugs such as iodides, phenylbutazone, thiouracil, isoproterenol, heavy metals, sulfisoxazole, and phenothiazines cause parotid swelling.