A chalazion is a small, hard lump that develops under the skin on the eyelid. It is caused by a blockage in one of the small oil glands in the eyelid. Chalazions can occur on both the upper and lower eyelids.
On a dog, a chalazion will appear as a small, round bump on the eyelid. The bump may be reddish or have a bluish tint. It is usually not painful, but it can cause swelling and irritation of the eye. If left untreated, a chalazion can lead to an infection of the eyeball and permanent damage to vision.
Chalazions are relatively common in dogs and are most often seen in middle-aged or older animals. They can be caused by allergies, trauma to the eye, or an underlying medical condition such as diabetes or Cushing’s disease. Treatment involves antibiotics and/or surgery to remove the blockage from the gland.