What can cause a bilateral cyst in parotid glands?

Hmmmm. Sjogren's, head/neck radiation, genetics, dehydration. Get some lemon drops to promote salivation.
Parotid cysts. We sometimes see them with HIV infections. Occasionally other causes can result in parotid cysts but HIV is a consideration.

Related Questions

What can cause radiopaque lesions on your parotid glands?

ENT. The term you refer to is used moreso for xrays, which is not the imaging study of choice for the parotid lesions. You should see your local ENT if possible to evaluate. Most parotid "masses" are benign, but a fine needle aspiration would reveal more about a parotid lesion. Read more...
Sailvary Stones . Are the most likely answer but there are other lesions(both benign and malignant) which can have radiopaque aspects of the lesion.(chronic sclerosing sialadenitis (küttner’s tumour) of the parotid gland for example). Read more...

What can cause the parotid glands to become painful?

Stones...masses. Inflammatory processes inside the parotid gland can cause pain. This can be from a stone/sludge blocking the drainage system or from a lump in the gland from a tumor. Positive signs- reapidly developing swelling, pain, foul taste in the mouth when you press on the face. Bad signs- change in the movement of the face muscles, trouble swallowing. Get checked out by an ENT soon. Read more...