A red, irritated area around your cat’s anus usually points to one of a handful of common problems: blocked or infected anal glands, intestinal parasites, allergies, or simple irritation from diarrhea. Most causes are treatable and not emergencies, but a few signs do warrant an urgent vet visit. Here’s how to tell what you’re likely dealing with.
Anal Gland Problems
Cats have two small scent glands just inside the anus, at roughly the four o’clock and eight o’clock positions. These glands normally express a small amount of fluid when your cat has a bowel movement. When the glands become clogged (impacted), infected, or abscessed, the surrounding skin turns red, swollen, and visibly irritated.
Impacted anal glands feel like hard, pea-sized lumps near the anus and contain a thick, pasty brown secretion that can’t drain on its own. If an impacted gland progresses to an infection or abscess, you’ll notice more pronounced discoloration of the skin, sometimes with an oozing sore right next to the anus. In severe cases, the abscess can rupture through the skin, creating an open wound.
The behavioral clues are pretty distinctive. A cat with anal gland trouble will scoot its rear along the floor, lick or bite at the area obsessively, and strain or cry during bowel movements. Some cats become constipated because defecation is painful. If you’re seeing red skin plus scooting and licking, anal glands are the most likely culprit. A vet can manually express the glands and prescribe treatment for any infection.
Tapeworms and Other Parasites
Intestinal parasites, especially tapeworms, can cause enough irritation around the anus to make the area red and inflamed. The most common tapeworm in cats is spread through fleas: your cat swallows an infected flea while grooming, and the tapeworm grows in the intestine.
The telltale sign is tiny, rice-grain-sized segments (called proglottids) crawling near your cat’s anus or sitting on the surface of fresh stool. Dried-out segments are small, hard, and yellowish, and you may spot them stuck to the fur around the rear end. These segments are about 2 millimeters long. Interestingly, most cats with tapeworms don’t act sick otherwise, so the wiggling segments and the redness they cause may be your only clue.
Standard fecal exams at the vet often miss tapeworms entirely. Diagnosis usually depends on you, the owner, actually seeing the segments. If you notice anything that looks like grains of rice near your cat’s rear, mention it to your vet. Treatment is straightforward and effective.
Food Allergies and Skin Reactions
Food allergies in cats most often show up as itchy, irritated skin on the head and neck, but they can affect other areas too, including the skin around the anus. Common triggers include proteins your cat eats regularly: beef, chicken, turkey, pork, lamb, eggs, and sometimes grains like wheat, barley, or corn.
If the redness comes and goes, or if your cat also has itchy patches elsewhere on its body, a food allergy is worth considering. Diagnosing a food allergy requires an elimination diet, where your cat eats a single novel protein (one it hasn’t had before) and a novel carbohydrate like potato for several weeks to see if symptoms clear up. There’s no reliable blood test for food allergies in cats, so this dietary trial is the standard approach.
Diarrhea and Simple Irritation
Sometimes the explanation is the simplest one. Repeated bouts of diarrhea or soft stool can leave the delicate skin around the anus raw and red, the same way a diaper rash develops in babies. If your cat recently ate something unusual, switched foods abruptly, or has been having loose stools for any reason, the redness could just be mechanical irritation. Resolving the diarrhea typically resolves the redness within a few days.
Signs That Need Urgent Attention
Most causes of perianal redness are uncomfortable but not dangerous. A few situations are different:
- A protruding mass. An elongated, cylinder-shaped mass pushing out through the anal opening suggests a rectal prolapse, where part of the intestinal lining has pushed outside the body. This requires prompt veterinary care regardless of whether it’s a partial or complete prolapse.
- Active bleeding. Rectal bleeding, blood in the stool, or reluctance to defecate paired with straining can signal a rectal tear. These wounds need treatment quickly to prevent infection.
- A ruptured abscess. If you see an open, draining wound next to the anus with significant swelling and your cat is in obvious pain, an anal gland abscess has likely burst. This needs antibiotics and professional care.
Polyps can also cause straining, bloody stool, and diarrhea, and they occasionally protrude from the anus. These aren’t always emergencies, but they do need a vet’s evaluation.
What You Can Do at Home
If the redness looks mild and your cat isn’t in obvious distress, a cool compress can help with inflammation. Run a soft washcloth under cool water, wring it out, and gently hold it against the area if your cat tolerates it. For extra soothing, you can refrigerate the damp washcloth for an hour before applying it.
Avoid using any human topical products like hydrocortisone cream, Neosporin, or diaper rash ointment. Cats groom themselves constantly, and many common over-the-counter products are toxic when ingested. Keep your cat from eating anything unusual in the meantime, including hunted prey and human food, both of which can worsen gastrointestinal irritation. If the redness doesn’t improve within a day or two, or if your cat is scooting, straining, bleeding, or seems painful, a vet visit will get you a clear answer and a treatment plan.