Blackheads on Dogs: Paws, Belly, Nipples and Skin

Name: Blackheads on Dogs: Paws, Belly, Nipples and Skin
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-02

Blackheads in dogs paws and other hairless or thinly haired spots are small dark plugs of oil and dead skin cells trapped in hair follicles. Most are harmless cosmetic findings, but clusters that keep coming back, or that come with redness, swelling, itching, or hair loss, often point to an underlying skin or hormonal problem. This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

A true blackhead (comedone) is a widened hair follicle packed with dark keratin and oil, and it is most common where fur is thin, such as the belly, armpits, nipples, and paw pads.
Occasional blackheads on a dog with healthy skin need no treatment beyond gentle cleansing and monitoring.
Clusters of blackheads plus redness, odor, crusting, itching, or hair loss usually mean dermatitis, allergies, or infection and need a veterinary exam [1].
Never squeeze, pick, or scrub blackheads hard, because this can break the skin and let bacteria in.
Any black spots that grow, bleed, ulcerate, or change quickly should be checked to rule out tumors or other serious skin disease.

What Blackheads on Dogs Actually Look Like

A blackhead is a comedo, a hair follicle whose opening has widened and filled with a mix of keratin (dead skin protein) and sebum (skin oil). The plug looks dark because of oxidized oil and pigment, not because dirt is stuck in the pore. On dogs, comedones appear as tiny black or dark brown dots, often in a line or patch, sitting flat against the skin.

They show up most often in areas with sparse hair and more friction or moisture. That includes the belly, the armpits (axillae), around the nipples, the groin, the ear flaps, and the paw pads and interdigital spaces. Some dogs also get them along the chin or lips.

Normal skin can have a few comedones, especially in middle-aged and older dogs, and in breeds with oily or greasy coats. A dog with a healthy coat, no redness, no itching, and no odor can have a handful of blackheads that never cause a problem. The trouble starts when the skin around them changes.

Why Blackheads Cluster on Paws, Belly, Nipples, and Ears

Blackheads in dogs paws

Paws take constant abuse. They press against concrete, gravel, and rough flooring, and they stay damp after walks, baths, or licking. A study of dogs housed in commercial breeding facilities found that wet paws were common (12.6% of dogs) and that being male raised the odds of wet paws about six times, while older age raised the odds of matted paw fur [2]. Moisture and matting trap oil and debris in the follicles between the toes and on the pads, which is where blackheads form.

Friction itself can damage paw skin. A frictional dermatosis called "pavement paws" develops on the uncalloused pads of puppies after repeated rubbing against ambient-temperature paved roads, and it is not a burn from a hot surface [3]. Repeated low-grade irritation like this can clog follicles and set the stage for blackheads and pododermatitis.

Blackheads in dogs belly and armpits

The belly and armpits are thin-skinned, warm, and often rest against the ground or bedding. That combination of warmth, moisture, and friction favors comedo formation. These areas are also prime real estate for contact dermatitis and for urine or moisture-related irritation. In a study of urine scalding in dogs and cats, lesions in incontinent animals included white papules and plaques and ulcers that localized to the perigenital area and could involve the abdomen, inguinal areas, and proximal legs [4]. Ongoing urine or moisture contact on the belly can inflame follicles and mimic or worsen blackheads.

Blackheads in dogs nipples

The skin around the nipples is thin and hairless, so follicles there are easy to see. Comedones around the nipples are common and usually benign. They become a concern when they are paired with swelling, discharge, redness, or firm lumps, because mammary tissue sits directly beneath that skin. Blackheads on the nipples themselves are usually follicular, but any new lump in the mammary chain deserves a veterinary check.

Blackheads in dogs ear

The ear flap (pinna) has fine hair and thin skin, and it collects oil and debris. Comedones on the pinna can be simple follicular plugs, but they can also be part of a keratinization disorder. In a study of 16 French Bulldogs with pinnal parakeratotic hyperkeratosis, all 16 had bilateral pinnal hyperkeratosis, and 6 also had lesions on the nasal bridge, scrotum, or tail [5]. Eight of 12 dogs given oral zinc improved or fully resolved, including 4 that responded to zinc alone [5]. That pattern shows that ear blackheads and crusting can sometimes reflect a nutritional or hereditary skin condition, not just clogged pores.

Blackheads in dogs skin generally

Across the body, comedones are a final common pathway. Anything that increases oil production, slows skin cell turnover, or inflames the follicle can produce them. Dermatitis is the general term for skin inflammation from irritants, allergens, trauma, or infection, and it shows up as itching, scaling, redness, thickening, pigment change, odor, oiliness, or hair loss [1]. Blackheads are often one small piece of that larger picture.

Main Causes and How Urgent They Are

Cause	Typical clues	How urgent
Simple follicular plugging	A few black dots, no redness, no itch, normal coat	Routine, monitor at home
Allergies and dermatitis	Itching, redness, licking paws, recurrent ear or skin infections	See a vet soon
Bacterial or yeast infection	Odor, crusts, pus, spreading redness, hair loss	See a vet promptly
Hormonal disease (thyroid, adrenal)	Symmetric hair loss, dark thickened skin, pot belly, lethargy	See a vet soon
Keratinization disorder	Widespread scaling, greasy coat, crusting on ears or nose	See a vet soon
Friction or moisture irritation	Wet, matted paws, calluses, redness between toes	Routine to soon
Urine or moisture scalding	Sores on belly, groin, or legs in an incontinent dog	See a vet promptly
Sebaceous gland tumor	A firm bump or nodule, sometimes on or near the eyelid	See a vet promptly

Sebaceous gland tumors are common skin growths in dogs and include adenomas and adenocarcinomas [6]. A blackhead is not a tumor, but a dark bump that grows or changes should be examined so a veterinarian can tell the difference. If your dog has raised or changing lumps, see our guide to dog skin bumps and skin growths on dogs.

Red Flags That Need a Veterinarian Now

Some skin changes cannot wait. Contact a veterinarian the same day if you see any of these:

Rapidly spreading redness, swelling, or heat in the skin
Open sores, ulcers, or skin that is sloughing
Pus, heavy discharge, or a foul odor
Your dog is painful when the area is touched, or is limping
Blackheads or crusts on the ears with head shaking, ear pain, or balance problems
A firm, fast-growing lump, or a lump that bleeds or ulcerates
Widespread hair loss with weight change, appetite change, or lethargy
Inability to urinate, straining to urinate, or urine soaking the belly and legs

These signs can reflect deep infection, hormonal disease, or another serious condition, and home care is not enough.

Safe Things You Can Do at Home While You Wait

You can support the skin without risking harm. Keep the area clean and dry, and gently wipe the belly, armpits, and paws with a soft cloth and lukewarm water after walks or after your dog urinates on itself. Pat dry instead of rub.

Do not squeeze, pick, or scrub blackheads. Picking breaks the follicle and can push bacteria deeper, turning a cosmetic issue into an infection. Avoid harsh human acne products, alcohol, and undiluted essential oils, because dog skin is thinner and more sensitive than human skin.

If your dog has a greasy coat or scaling, a veterinarian may recommend a medicated shampoo. A 2023 study of dogs with an undiagnosed chronic greasy keratinization disorder found that a shampoo followed by mousse applications containing plant extracts reduced clinical scores by 53% between day 0 and day 7, reaching 91% improvement by day 24 [7]. That is a specific protocol, so ask your veterinarian which product and schedule fit your dog instead of guessing.

Keep a simple log. Note when the blackheads appeared, which body areas are involved, whether your dog is itchy or licking, and any diet, shampoo, or medication changes. This history helps your veterinarian narrow the cause quickly. If itching and paw licking are the main problems, our articles on dog itchy skin ears and paws and dog scratching ears and paws cover those patterns in more detail.

What Your Veterinarian Will Check and Test

Your veterinarian will start with a full skin exam, including the paws, nail beds, ears, belly, groin, and nipples. They will look for redness, scaling, thickening, pigment change, odor, and hair loss, because dermatitis can show any combination of these signs [1].

Common tests include:

Skin scraping to look for mites
Cytology (tape prep or swab) to check for bacteria and yeast
Fungal culture if ringworm is suspected
Skin biopsy for stubborn or unusual lesions
Blood work to screen for thyroid or adrenal disease
Allergy testing or a diet trial if allergies are suspected

If the problem is a keratinization disorder, treatment may include specific supplements. In the French Bulldog study, oral zinc supplementation helped 8 of 12 dogs, with 4 responding to zinc alone [5]. Your veterinarian will decide whether zinc or another treatment is appropriate, and they will calculate any dose from your dog's weight and health.

Prevention and Monitoring

Prevention focuses on keeping skin clean, dry, and calm.

Dry the paws, belly, and skin folds after every walk, bath, or swim.
Trim matted fur around the paws and groin so moisture cannot sit against the skin.
Use smooth, easy-to-clean flooring where your dog rests, since rough or wet surfaces are linked to paw problems [2].
Bathe with a veterinarian-recommended shampoo on a schedule that matches your dog's coat.
Manage allergies and infections early, because chronic inflammation keeps follicles clogged.
Check the belly, armpits, nipples, and ears once a week so you notice changes early.
Keep routine wellness visits, especially for older dogs or breeds prone to skin disease.

If blackheads keep returning in the same spot, that is a signal to look for an underlying cause instead of treating the surface again and again.

Limitations and When to Contact a Veterinarian

This article cannot diagnose your dog. Blackheads can look like other skin findings, including infections, parasites, hormonal disease, and tumors, and only a veterinarian can tell them apart. Individual cases need a veterinarian who can examine your dog and run the right tests.

Contact your veterinarian the same day for spreading redness, swelling, pain, pus, odor, open sores, or a dog that will not bear weight on a paw. Go to an emergency clinic now for severe pain, a rapidly enlarging or bleeding mass, difficulty breathing, collapse, or a dog that cannot urinate. Schedule a routine visit for persistent blackheads, mild itching, or any skin change that has lasted more than a week or two.

Frequently Asked Questions

Are blackheads on dogs paws contagious to other pets or to people?

No, simple clogged follicles do not spread between pets or to people. However, some conditions that look similar, such as certain bacterial or fungal skin infections, can spread, so a veterinarian should confirm what you are seeing before you assume it is harmless.

Can I use human acne cleansers on my dog?

It is safer not to. Human products are formulated for thicker human skin and different pH, and they can dry, burn, or irritate your dog's skin. Ask your veterinarian for a dog-safe cleanser or medicated shampoo instead.

Do blackheads on the belly mean my dog has a hormone problem?

Not by themselves. A few blackheads on the belly are common and benign, but they become more suspicious when paired with symmetric hair loss, dark thickened skin, weight change, or lethargy, which are patterns a veterinarian will evaluate with an exam and blood work.

Should I pop a blackhead on my dog?

No. Squeezing can rupture the follicle, cause bleeding, and push bacteria into the skin, which can turn a minor cosmetic issue into an infection. Leave the blackhead alone and let your veterinarian decide if any treatment is needed.

How long does it take for blackheads on dogs to clear up?

It depends on the cause. Simple follicular plugging may fade with gentle cleansing over a few weeks, while cases tied to allergies, infection, or keratinization disorders can take longer and need specific treatment. A 2023 study found marked improvement in greasy coat and skin scores within about a week of a medicated shampoo and mousse protocol, with further gains by day 24 [7].

References

Dermatitis and Dermatologic Problems in Dogs - Dog Owners. Merck Veterinary Manual.
A cross-sectional study to investigate associations between flooring substrates and prevalence of limb and paw abnormalities of dogs housed in commercial breeding facilities. Frontiers in veterinary science, 2025.
Comparative dermatology--pavement paws: frictional dermatosis in puppies analogous to pool toes. Dermatology online journal, 2024.
Clinical and histopathological features of urine scalding in dogs and cats. Veterinary pathology, 2026.
Pinnal Parakeratotic Hyperkeratosis Consistent With Zinc-Responsive Dermatosis in 16 French Bulldogs. Veterinary dermatology, 2026.
Sebaceous neoplasm in the lung of a dog. Australian veterinary journal, 2025.
Performance and Tolerance of a Protocol for Idiopathic Chronic Greasy Seborrhea in 18 Dogs Using a Shampoo and Mousse Containing Plant Extracts. Veterinary sciences, 2023.