A mass on the eye should be judged based on the location of the mass, the size and activity of the mass, and whether it is accompanied by other symptoms. The most common type of mass, a chalazion on the eye, can appear as a limited mass with redness, swelling, heat, and pain, accompanied by significant pressure pain, and will basically improve and heal after local anti-inflammatory symptomatic treatment with hot compresses. In patients with chalazion, a sliding painless mass can usually be palpated on the upper eyelid, and a dark red lesion can be seen by turning the lid conjunctival surface. Patients with chalazion may consider chalazion removal if heat application does not work and if it is large. If it grows superficially under the skin and is relatively mobile, it may also be caused by a lipoma, or subcutaneous cyst. If the chalazion is deeper in the orbit, near the lid margin, it may also be considered an orbital tumor or a tumor of the lacrimal gland.