Follicular Cysts in Dogs: A 2025 Vet Skin Care Guide by Dr Duncan Houston 🐶🧴
By Dr Duncan Houston, BVSc | July 2025
🔍 What Are Follicular Cysts?
Follicular cysts are benign nodules or bumps that originate from a dog’s hair follicle. They are typically slow-growing, but can become itchy, inflamed, or even infected as they enlarge. These skin masses often appear as smooth, round swellings that may release a thick white, yellow, or brown substance. 🧪
🧬 Alternative Names
Follicular cysts may be referred to as:
- 🧫 Infundibular cysts (epidermoid cysts, sebaceous cysts)
- 🔬 Isthmus or tricholemmal cysts (isthmus-catagen cysts)
- 🧠 Matrical cysts
- 🌱 Hybrid or panfollicular cysts
🩺 What Do They Look Like?
These cysts can be:
- 👁️ Visible as solitary bumps (rarely multiple)
- 💥 Sometimes painful or itchy
- 🌡️ Oozing thick discharge if ruptured
- 📍 Found anywhere on the body, especially on the trunk or limbs
🔬 How Are They Diagnosed?
Your veterinarian may perform:
- 💉 Fine needle aspirate: A needle collects cells for microscopic review
- 🔪 Surgical biopsy: Recommended for growing, painful, or suspicious lesions
These steps help differentiate follicular cysts from tumors or other types of skin masses. 🧫
💊 Treatment Options
While benign, follicular cysts may require treatment if they become problematic. Options include:
- 🔍 Monitoring: If small and not causing discomfort
- 💊 Antibiotics: If the cyst becomes infected; your vet may perform a culture first
- 🔪 Surgical removal: Recommended for painful, ruptured, or recurring cysts
🛑 Once removed completely, follicular cysts do not grow back.
📋 Quick Reference Table: Follicular Cysts
| Aspect | Details |
|---|---|
| Common Locations | Trunk, limbs, skin surface |
| Appearance | Round, raised bump; may ooze or swell |
| Diagnosis | Needle aspirate, biopsy |
| Treatment | Antibiotics, surgery if inflamed or infected |
| Prognosis | Excellent—noncancerous and curable via removal |
🧼 Home Monitoring Tips
- 🔍 Check weekly for new or growing lumps
- 📏 Monitor cysts for size, discharge, and irritation
- 🚫 Avoid squeezing or popping them
- 📸 Take photos monthly to track changes
- 👨⚕️ Schedule rechecks for any rapid growth, pain, or rupture
🔧 Ask A Vet Can Help
Worried about a new bump or swelling on your dog’s skin? Use the Ask A Vet app to share photos with a vet, get an accurate diagnosis, and decide if removal is needed. 🐾📱
🐾 Final Thoughts from Dr Duncan Houston
Follicular cysts are common and usually harmless—but they can become painful or infected if left untreated. A quick vet check and simple surgery can offer a permanent solution for your pup’s skin comfort. 💙🐶
— Dr Duncan Houston, BVSc
Visit AskAVet.com or download the Ask A Vet app to get fast, expert advice on skin lumps, cysts, and treatment options. 📱
This article is general veterinary education and does not diagnose or treat an individual animal. Always confirm medication names, doses and interactions with the veterinarian who knows your pet.
If your animal is struggling to breathe, collapsed, bleeding heavily, seizing, or has eaten something toxic, contact your vet or the nearest emergency clinic now.
Animal Poisons Helpline (AU) 1300 869 738 · Animal Poisons Helpline (NZ) 0800 869 738 · ASPCA Animal Poison Control (US) (888) 426-4435
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Ask A Vet articles are written by Dr Duncan Houston BVSc, a practising veterinarian, unless another author is named in the byline.
