Red Bumps and Hair Loss: Understanding Folliculitis in Dogs

In this guide

Folliculitis, inflammation of the hair follicles, is one of the more common skin conditions in dogs and shows up as small red bumps, often mistaken for simple acne or an allergic rash.

What causes it

• Bacterial infection, the most common underlying cause, often a secondary problem rather than a stand alone one
• Underlying allergies, whether food, flea, or environmental, that damage the skin barrier and let bacteria take hold
• Mites such as Demodex, particularly in young dogs or those with a weakened immune system
• Fungal infection (ringworm)
• Hormonal imbalances, in more chronic or recurrent cases

What it looks like

• Small red bumps or pustules, sometimes with a hair shaft visible in the centre
• Patchy hair loss where follicles are affected
• Scabbing or crusting as bumps rupture and heal
• Itching, though not always present, especially in short coated breeds where it is easier to see

Diagnosis and treatment

A vet will usually examine a skin scraping or impression smear under a microscope to identify bacteria, mites, or fungal elements, since treatment differs considerably depending on the cause. Bacterial folliculitis typically responds to a course of antibiotics and medicated shampoo, while mite or fungal causes need targeted treatment instead.

Because folliculitis is so often secondary to an allergy, recurrent cases usually need that underlying allergy identified and managed, otherwise the skin infection simply returns once antibiotics stop.

Common Questions

Q: Is folliculitis contagious to other dogs in the house? A: Bacterial folliculitis generally is not contagious, but if the underlying cause is ringworm, that specific form can spread between pets.

Q: Can regular bathing help prevent folliculitis? A: Yes, particularly in allergy prone dogs, a vet recommended medicated shampoo routine can meaningfully reduce flare ups.

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