A Chalazion is a lump on the eyelid that forms due to the blockage and swelling of an oil gland in the eyelid. The oil produced can become thick and is unable to flow out of the gland, creating a lump on the eyelid. It may appear as a red, tender, swollen area on the eyelid, but usually switches to a painless, slow growing lump. It is usually not due to an infection. Warm compresses and lightly messaging the area may help facilitate healing. Most chalazia resolve on their own without treatment, but on occasion, they may have to be removed. If the chalazion does not drain and heal within a month, you should have it evaluated by one of our doctors.