The most common symptom of salivary gland cancer is a swelling on the side of the face, just in front of the ears, or under the jawbone. Some people also have some numbness and drooping of one side of the face (facial palsy).
These symptoms may occur with conditions other than cancer, and most people with these symptoms won′t have a salivary gland cancer. However, like most cancers, salivary gland cancers are best treated when diagnosed at an early stage. You should tell your GP about these symptoms if they do not improve over a few days.