TL;DR: Most small white bumps on a dog's eyelid are benign cysts, but you should consult a veterinarian if the growth changes rapidly or if your dog shows signs of eye pain like squinting or redness.
What causes a small white bump on my dog's eyelid?
A small white bump on the rim of a dog's eyelid is most commonly a meibomian gland cyst (also called a chalazion) or a sebaceous gland adenoma. These occur when the oil-producing glands located along the eyelid margin become blocked or overgrow. Other possibilities include a stye (an infection of the gland) or, in some cases, a small viral papilloma or benign tumor. While most of these growths are non-cancerous, they can sometimes cause irritation to the surface of the eye if they rub against the cornea.
Is a white bump on my dog's eyelid a veterinary emergency?
- The urgency level for this condition is generally low, especially for small, slow-growing bumps that are not causing obvious pain.
- Schedule a routine veterinary appointment if the bump grows rapidly, changes color, or begins to bleed.
- Seek care sooner if your dog is squinting, rubbing at the eye, or if the eye itself appears red and cloudy, as these are signs of secondary irritation or corneal injury.
How does a photo help the veterinarian triage my dog's eyelid bump?
- A clear, high-resolution photo allows the vet to zoom in on the exact location, shape, and texture of the bump without the dog moving or blinking.
- This helps the medical team differentiate between a simple clogged pore and a growth that may require surgical removal.
- Photos provide a baseline to track if the bump is getting larger over time.
Clinical Context (Merck Veterinary Manual)
Small white bumps on a dog's eyelid can be caused by blepharitis, which is inflammation of the eyelids resulting from generalized dermatitis, conjunctivitis, local glandular infections (stye of glands of Zeis and Moll, chalazion of Meibomian glands), or irritants. Dermatomycetes, Demodex canis, or staphylococci can also be involved. Immune-mediated diseases such as pemphigus may also manifest at the mucocutaneous junction. Diagnosis may require skin scrapings, cultures, and biopsies. Neoplasia should also be considered, although eyelid tumors are less frequent in dogs than other conditions.
Chapter: Ophthalmology, Dermatology
Source: The Merck Veterinary Manual, 11th Edition (Page 490)