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. 📱
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