This is the gland that is affected by Mumps. Lumps (tumours) in the parotid gland are common and are seen in all age groups. They are the result of an abnormal growth of cells within the gland, though the exact reasons for this are not clear. The vast majority (approximately 80%) of these tumours are not cancerous and are called benign tumours. Rarely, however, some tumours can be cancerous.
Other common causes of lumps in the gland include stones in the duct of the gland, which often block the flow of saliva. This blockage often gives rise to infections, which can sometimes be troublesome. Whatever the cause, however, it is prudent to establish the EXACT NATURE of the swelling.