Black spots on your cat’s gums are almost always lentigo simplex, a completely harmless pigmentation condition similar to human freckles. This is especially likely if your cat is orange, calico, or tortoiseshell. The spots are flat, painless, and require no treatment. That said, not every dark spot is benign, so knowing what to look for makes a real difference.
Lentigo Simplex: The Most Common Cause
Lentigo is a benign condition where cells that produce pigment (melanocytes) increase in number in a small area, creating dark brown to black flat spots. These spots, called lentigines, typically show up on the lips, gums, tongue, inside the cheeks, and around the nose or eyes. They’re not caused by illness, infection, sun exposure, or anything in your cat’s environment. The condition is believed to be hereditary.
Orange, calico, and tortoiseshell cats have a strong genetic predisposition to lentigo. Both males and females develop it, and no specific breed is more prone than others. The spots can appear as early as kittenhood, often starting as tiny pinpoint marks on the lips or nose before showing up on the gums. Over time, existing spots may grow slightly larger, and new ones can appear. This gradual increase is normal and not a sign that something is going wrong.
The key features of lentigo spots are that they’re perfectly flat against the gum surface, have clearly defined edges, and are surrounded by normal-looking tissue. They don’t bother your cat, don’t bleed, and don’t change the texture of the gum. Think of them as the feline equivalent of freckles on a redhead.
What Harmful Spots Look Like
Oral melanoma, while rare in cats, is the serious condition worth ruling out. The visual differences between melanoma and lentigo are distinct. Malignant tumors tend to be raised above the gum surface rather than flat. They grow quickly over weeks rather than slowly over months or years. The surface is often ulcerated, meaning it looks raw, broken, or bleeds easily. The borders tend to be irregular and poorly defined compared to the neat edges of a lentigo spot.
Melanoma tumors in cats most commonly appear on the gingiva (the gum tissue around the teeth), lips, tongue, and the roof of the mouth. A cat with oral melanoma may also show signs like difficulty eating, drooling, facial swelling, loose teeth, or bad breath that develops suddenly. A lentigo spot causes none of these symptoms.
Gum Disease Can Change Color Too
Periodontal disease is another reason your cat’s gums might look discolored, though it usually doesn’t produce distinct black spots. When bacteria build up along and below the gum line, the tissue becomes inflamed. Healthy cat gums are salmon pink. With gingivitis (the early stage), gums shift to red or purple, swell along the edges, and bleed easily when touched. Advanced periodontal disease involves damage to the ligaments and bone that hold teeth in place, with the same color changes plus potential tooth loosening.
If what you’re seeing looks more like a dark, reddish-purple discoloration along the gum line rather than a distinct flat spot, gum disease is a more likely explanation than lentigo. You might also notice brown tartar buildup on the teeth, bad breath, or your cat avoiding dry food.
How to Check Your Cat’s Mouth at Home
Wait until your cat is relaxed and comfortable being handled. Having a second person hold the cat makes this much easier. Gently tip the head slightly back and to the side, then use your thumbs to pull the lips back. Check the gums on both sides and as far back as you can see. You want good lighting for this.
If your cat won’t tolerate a mouth check, don’t force it. Just ask your vet to look during regular visits instead.
When you’re looking at a spot, note these details:
- Texture: Is the spot completely flat, or does it rise above the gum surface?
- Edges: Are the borders sharp and well-defined, or ragged and blurry?
- Surface: Is the tissue intact and smooth, or does it look raw, ulcerated, or prone to bleeding?
- Size changes: Is it growing noticeably over a few weeks, or has it stayed roughly the same?
A flat, well-defined, smooth spot that changes slowly (or not at all) is consistent with lentigo. A raised, irregular, fast-growing, or ulcerated mass warrants a vet visit soon. Taking a photo each month gives you a reliable way to track changes rather than relying on memory. Vets generally recommend checking your cat’s mouth once a month at home, with professional dental exams every 6 to 12 months.
When the Spots Need Attention
Lentigo itself never requires treatment. No medication, no removal, no dietary changes. The spots are purely cosmetic and will likely continue to appear throughout your cat’s life, especially if your cat is orange or tortoiseshell.
Schedule a vet appointment if you notice any spot that is raised or has a bumpy texture, is growing rapidly over days to weeks, appears ulcerated or bleeds, or is accompanied by other symptoms like drooling, difficulty eating, weight loss, or facial swelling. Your vet can distinguish between benign pigmentation and something concerning with a visual exam and, if needed, a biopsy of the tissue.
For most cats, especially orange ones, those dark gum spots are nothing more than a genetic quirk. They’ll likely develop more of them as they age, and each one is just as harmless as the last.