Muzzle Folliculitis and Furunculosis (Chin Acne, Muzzle Acne) in Dogs
Katherine Doerr, DVM, ACVD Published: June 29, 2020
Muzzle folliculitis and furunculosis (chin acne, muzzle acne) is inflammation of the muzzle and lips in dogs. It occurs most often in young dogs of short-coated breeds. When dogs play or rub the chin area, hairs are broken and pushed beneath the skin surface. This leads to skin irritation, inflammation, and infection. Dogs present with bumps and redness under the chin and on the lips. Your veterinarian may obtain skin samples from your dog and examine them under a microscope to look for a bacterial infection (pyoderma), yeast infection (Malassezia), or parasite (Demodex mite causing demodicosis). If the bacterial skin infection is severe and needs an antibiotic, your veterinarian may send a sample to a laboratory for a skin culture. Occasionally, your vet may also take samples to look for a fungal infection (ringworm). Treatment may include topical or oral medications to treat skin infection and inflammation. Because some dogs rub the muzzle from itching your veterinarian may also discuss allergies and other causes of itching.
Pyoderma
Pyoderma is a bacterial skin infection, often referred to as bacterial dermatitis, that can affect dogs and cats. It's characterized by various skin lesions like pustules, papules, crusts, and epidermal collarettes, often accompanied by redness, itching, and sometimes a foul odor. Pyoderma is typically secondary to an underlying issue that compromises the skin's natural defenses, such as allergies, parasites, or hormonal imbalances. Treatment usually involves addressing the underlying cause, topical antibacterial treatments (like medicated shampoos), and sometimes oral antibiotics.
Key aspects of pyoderma:
Definition: Pyoderma is a bacterial infection of the skin, with "pyo" meaning pus and "derma" meaning skin.
Types:Pyoderma can be classified by the depth of the infection: surface, superficial, or deep.
Causes:Pyoderma often arises from underlying conditions that disrupt the skin's barrier function, making it susceptible to bacterial invasion. Common culprits include allergies, parasites (like mites), seborrhea, and hormonal imbalances.
Symptoms:Symptoms vary depending on the type and severity of pyoderma but can include redness, itching, pustules, papules, crusts, scaling, and in deeper infections, pain, swelling, and draining tracts.
Diagnosis:Veterinarians will diagnose pyoderma based on clinical signs, skin scrapings, and sometimes bacterial cultures to identify the specific bacteria and determine antibiotic sensitivity.
Treatment:Treatment typically involves addressing the underlying cause, topical antibacterial treatments (shampoos, sprays, or washes), and potentially oral antibiotics for more severe or deep infections.
Contagious Nature:
Pyoderma is generally not contagious between dogs and humans, with humans typically developing infections from other Staphylococcus species that are better adapted to them, according to the American Kennel Club.
Examples of pyoderma types:
Surface pyoderma: Affects the skin's surface, causing redness and itching, sometimes with a greasy appearance.
Superficial pyoderma:Involves the hair follicles and outer skin layer, often called superficial bacterial folliculitis.
Deep pyoderma:Extends into the deeper layers of the skin, causing pain, swelling, and potential drainage.
Note: If pyoderma is suspected, it's crucial to consult with a veterinarian for proper diagnosis and treatment, as addressing the underlying cause is essential for long-term management.
Yeast Infection
Malassezia yeast infections, also known as fungal acne or pityrosporum folliculitis, occur when Malassezia yeasts, normally found on the skin, overgrow and infect hair follicles. These infections are characterized by itchy, red, and sometimes pustular or scaly bumps, often on the torso, neck, and arms. Treatment typically involves topical antifungal creams, shampoos, or, in severe cases, oral antifungal medications.
Understanding Malassezia Yeast Infections:
Normal Skin Flora:Malassezia yeasts are a common part of the skin's natural microbiome.
Overgrowth:Infections arise when these yeasts multiply excessively, often due to factors like oily skin, excessive sweating, or a weakened immune system.
Symptoms:Malassezia folliculitis can manifest as small, itchy, red or skin-colored bumps, sometimes with pustules, and can be confused with bacterial acne.
Conditions Associated with Malassezia:Besides fungal acne, Malassezia can contribute to seborrheic dermatitis (characterized by scaling and inflammation on the scalp, face, and chest), and pityriasis versicolor (characterized by pigment changes in the skin).
Treatment Options:
Topical Antifungals: Over-the-counter or prescription creams and shampoos containing antifungal agents like ketoconazole, clotrimazole, terbinafine, selenium sulfide, or zinc pyrithione can be effective.
Oral Antifungals: In more severe or persistent cases, oral medications like itraconazole, ketoconazole, or fluconazole may be prescribed, according to Skin Therapy Letter.
Other Therapies: Some healthcare providers may also recommend photodynamic therapy or tea tree oil (after consulting with a doctor).
Important Considerations:
Chronic Recurrence: Malassezia infections can be chronic and recurrent, requiring ongoing management.
Concurrent Bacterial Infections: Malassezia infections can sometimes be complicated by secondary bacterial infections, which may require antibiotics.
Individualized Treatment: The best treatment approach will depend on the specific condition and individual circumstances, so it's crucial to consult with a healthcare professional for proper diagnosis and management.
Demodex Mites
Demodex mites are microscopic parasites that live in or near hair follicles on human and animal skin. While their presence is common, an overpopulation of these mites, known as demodicosis, can lead to various skin conditions. Demodicosis can manifest as redness, itching, scaling, and other symptoms, and may be mistaken for other skin issues.
Key Points:
Demodex mites are common: They are found on the skin of most adults and are considered normal.
Demodicosis is an overpopulation: When the mite population grows excessively, it can cause skin problems.
Symptoms can vary: Demodicosis can present with redness, dryness, scaling, itching, and other skin irritations.
Diagnosis can be tricky: Symptoms can mimic other skin conditions, making diagnosis challenging.
Treatment options exist: Various topical and oral medications can be used to treat demodicosis.
More Details:
Demodex Mites: There are two main species of Demodex mites that affect humans: Demodex folliculorum and Demodex brevis. They live in hair follicles and sebaceous glands, primarily on the face, eyelids, and scalp.
Canine Demodicosis | NDSR
Demodicosis: This condition arises when the mite population increases, often due to factors like weakened immunity, certain skin conditions, or poor hygiene.
Symptoms: Demodicosis can manifest in various ways, including:
Redness and inflammation: The skin may appear flushed or have patches of redness.
Itching and burning: A common symptom, causing discomfort and irritation.
Scaling and flaking: Dryness and peeling of the skin can occur.
Pimples and pustules: In some cases, small bumps or pus-filled lesions may develop.
Eye irritation: Demodicosis of the eyelids (Demodex blepharitis) can cause itching, burning, and crusting around the eyelashes.
Diagnosis: A dermatologist or other healthcare professional can diagnose demodicosis by examining the skin, potentially using a skin scraping or biopsy to identify the mites.
Treatment: Treatment options for demodicosis may include:
Topical medications: Creams and ointments containing medications like metronidazole, permethrin, or ivermectin may be prescribed, according to WebMD.
Oral medications: In some cases, oral medications like ivermectin or tetracycline may be used.
Eyelid hygiene: For blepharitis, special cleaning techniques and medicated eyelid wipes may be recommended.
Addressing underlying conditions: If demodicosis is secondary to another skin condition or immune issue, addressing that underlying condition is also important.
