Blepharocysts can be surgically removed for radical treatment. The lid gland is the largest sebaceous gland in the body, and there are a large number of lid glands, both in the upper and lower eyelids (the upper eyelid has a larger number of glands, approximately 30-40, and the lower eyelid has a smaller number of glands, approximately 20-30). These glands are arranged parallel to each other and are oriented perpendicular to the lid margin and open to the lid margin (figure below). If the ducts of the lid glands are blocked (as is common in patients with chronic conjunctivitis or blepharitis), the secretions from the glands will remain in the ducts and stimulate the surrounding tissues to form a fibrous tissue package that is chronically irritated, resulting in a round lump under the skin of the eyelid called a chalazion cyst (hard, painless, no redness or swelling on the skin surface; the lump is not obvious when the eyes are open and looks more obvious when the eyes are closed). Small chalazia are about the size of a grain of rice (not visible but palpable) and large ones are the size of a small peanut). Surgical removal can cure a chalazion, but surgery can only remove the surgically removed chalazion cyst and does not prevent other parts of the gland from developing (i.e., surgery only cures one chalazion cyst). (For the sake of understanding, an example: a lesion in one tooth can be cured by treatment, but this treatment does not prevent the other teeth from not developing the disease).