Folliculitis in Dogs: An Overview
Folliculitis is a skin condition that commonly affects dogs. Irritation of a hair follicle causes inflammation in the area, leading to swelling, redness, itchiness, pain, and other skin lesions. Although there are no dog breeds genetically predisposed to folliculitis, dogs prone to allergies are at a greater risk of developing this condition. It has a variety of causes, all of which require veterinary treatment.
What Is Folliculitis?
Folliculitis is a term used to describe the inflammation of a hair follicle that typically involves a bacterial infection. Hair follicles are tiny openings in the skin through which hair grows. In folliculitis, one or more follicles become irritated or infected, causing inflammation in the area.
Symptoms of Folliculitis in Dogs
Dogs with folliculitis may exhibit one or more skin lesions on their bodies. It can begin as a small raised area resembling acne (known as a papule). The affected area might become more elevated and fill with pus (known as a pustule).
Symptoms
Redness
Swelling
Itching
Papules
Pustules
Alopecia
Hyperpigmentation
Folliculitis may lead to itching, pain, redness, and hair loss (alopecia) that appears patchy across one or more areas of the dog’s body. Some dogs may develop crusty, flaky, round skin lesions known as epidermal collarettes. Hyperpigmentation (dark skin spots) might also occur in affected skin areas.
Causes of Folliculitis
Folliculitis in dogs occurs when one or more hair follicles are irritated by any of the following conditions:
Bacterial infection (often Staphylococcus bacteria)
Fungal infections (such as ringworm)
Parasites (fleas, ticks, or mites)
Trauma to the skin or hair
Systemic diseases (thyroid abnormalities or immune dysfunction)
Diagnosing Folliculitis in Dogs
Contact your veterinarian if you suspect your dog has folliculitis or any unexplained skin irritation. After reviewing your dog's signs and history, the vet will conduct a physical examination and may diagnose folliculitis through visual inspection. However, further testing is often necessary to identify the precise cause. Possible tests include the following:
Skin cytology to examine cells under a microscope
Skin scrape to check for parasites like mites
Skin biopsy, where tiny samples of the skin are removed surgically and sent to a pathologist for detailed analysis
Fungal or bacterial cultures
Blood work and urinalysis to assess organ function and blood cell counts
Treatment
Treating folliculitis in dogs depends on its underlying cause. Therapy usually involves both systemic medications and topical applications such as sprays, creams, ointments, and shampoos.
Topical treatments are often used to alleviate discomfort and reduce inflammation. Your vet might recommend regular medicated baths. Sprays, creams, or ointments containing steroids, antibiotics, or antifungal agents may also be necessary.
Bacterial folliculitis typically requires oral antibiotics, possibly over an extended period to fully eliminate the bacteria. Fungal folliculitis necessitates antifungal medications, with some infections needing long-term treatment.
Parasitic infections require medication to eradicate the parasites and supportive care to aid healing. Antibiotics might be prescribed for secondary infections.
If a systemic disease causes folliculitis, that disease must be addressed alongside the skin inflammation. Depending on the ailment, long-term or lifelong treatments may be necessary.
Prognosis for Dogs with Folliculitis
Prognosis varies depending on the cause of the condition. Folliculitis resulting from localized infection or irritation usually responds well to topical treatments and oral medications, with recovery often occurring within a few weeks. If an underlying systemic health issue causes folliculitis, the prognosis depends on the condition's severity and the dog's response to targeted treatments.
How to Prevent Folliculitis
Folliculitis in dogs cannot always be prevented. Early detection and treatment are the best methods to prevent worsening. Dog owners can mitigate risk by managing systemic health issues like hypothyroidism with appropriate long-term medication. Always consult your veterinarian at the first sign of skin issues.
