Mud fever is one of the most common and frustrating conditions UK horse owners face, particularly during wet winter and spring months. This painful skin infection can affect any horse but is especially prevalent in those living out or in muddy conditions. This comprehensive guide will help you prevent, recognize, and treat mud fever effectively.
What Is Mud Fever?
Mud fever (also called pastern dermatitis or scratches) is a bacterial skin infection that typically affects the lower legs, particularly the pasterns and heels. It's caused by bacteria (usually Dermatophilus congolensis) that thrive in wet, muddy conditions.
How It Develops
- Prolonged exposure to wet, muddy conditions softens the skin
- Skin becomes damaged through minor cuts, abrasions, or constant moisture
- Bacteria enter through damaged skin barrier
- Infection develops, causing inflammation and scabs
- If untreated, infection spreads and worsens
Recognizing Mud Fever
Early Signs
- Redness and heat in the affected area
- Slight swelling around pasterns or heels
- Sensitivity when touched
- Small scabs beginning to form
- Horse may be slightly lame or stiff
Established Mud Fever
- Thick, crusty scabs
- Significant swelling of lower leg
- Oozing or weeping beneath scabs
- Cracked, painful skin
- Hair loss in affected areas
- Lameness
- Heat and pain when touched
Severe Cases
- Extensive swelling up the leg
- Severe lameness
- Cellulitis (deep tissue infection)
- Fever and general unwellness
- Reluctance to move
Important: Severe cases require immediate veterinary attention.
Risk Factors
Environmental
- Muddy fields and gateways
- Wet, poorly drained paddocks
- Standing in dirty, wet bedding
- Prolonged exposure to rain
- Winter and early spring conditions
Horse-Related
- White or pink-skinned legs (more susceptible)
- Feathered legs (trap moisture and mud)
- Horses with compromised immune systems
- Previous history of mud fever
- Poor circulation in lower legs
Management-Related
- Over-washing legs (strips natural oils)
- Inadequate drying after washing
- Poor field management
- Lack of preventive care
Prevention Strategies
Field Management
- Improve drainage: Address waterlogged areas
- Create hardstanding: Use woodchip or hardcore around gates and water troughs
- Rotate grazing: Prevent fields becoming poached
- Fence off muddy areas: Limit access to worst spots
- Provide shelter: Allow horses to escape wet conditions
For winter field management: Winter Horse Care Tips.
Daily Leg Care
The golden rule: Keep legs clean and dry
Do:
- Pick out mud when dry and brush off gently
- Allow mud to dry before removing (wet brushing damages skin)
- Check legs daily for early signs
- Apply barrier cream to clean, dry legs
- Ensure legs are completely dry before turnout
Don't:
- Wash legs daily (strips natural protective oils)
- Scrub wet mud off (damages skin)
- Leave legs damp
- Use harsh chemicals or soaps
- Ignore early warning signs
Barrier Creams and Protection
- Apply barrier cream to clean, dry legs before turnout
- Reapply regularly, especially in very wet conditions
- Choose products designed for mud fever prevention
- Petroleum jelly can work as a budget option
- Ensure complete coverage of vulnerable areas
Turnout Boots
- Waterproof turnout boots protect legs from mud
- Useful for high-risk horses
- Must fit correctly to avoid rubbing
- Check and clean daily
- Not suitable for all horses (some remove them)
Clipping Feathered Legs
- Consider clipping heavy feather in winter
- Makes legs easier to keep clean and dry
- Reduces mud and moisture retention
- Requires appropriate rugging afterward
- Not suitable for all breeds or showing
Treatment
Mild Cases (Early Stage)
Step 1: Clean the Area
- Gently remove scabs (only if they come away easily)
- Wash with dilute antibacterial solution (chlorhexidine or iodine)
- Rinse thoroughly with clean water
- Pat dry completely with clean towel
Step 2: Apply Treatment
- Use antibacterial cream or spray
- Apply to clean, dry skin
- Follow product instructions
- Reapply as directed (usually daily)
Step 3: Keep Dry
- Stable horse if possible
- Ensure bedding is clean and dry
- Limit turnout to dry conditions
- Monitor closely for improvement
Moderate to Severe Cases
Veterinary Treatment Required
- Call your vet for assessment
- May require systemic antibiotics
- Anti-inflammatory medication for pain and swelling
- Specific topical treatments
- Possible bandaging
Your Role:
- Follow vet's treatment plan exactly
- Keep detailed records of treatment
- Monitor for improvement or deterioration
- Maintain strict hygiene
- Provide appropriate environment
The Scab Debate
To Remove or Not to Remove?
This is controversial, but current best practice suggests:
Remove scabs if:
- They come away very easily
- You need to apply topical treatment underneath
- Vet advises removal
- They're trapping infection
Don't force scab removal if:
- They're firmly attached
- Removal causes bleeding
- Horse is in significant pain
- You're unsure—consult your vet
Softening scabs:
- Soak in warm water with Epsom salts
- Apply warm compress
- Use specialized scab-softening products
- Be patient and gentle
Management During Treatment
Stabling
- Ideal during treatment
- Keeps legs clean and dry
- Allows close monitoring
- Use clean, dry bedding (avoid straw which can irritate)
- Muck out frequently
Limited Turnout
If stabling isn't possible:
- Turn out only in dry conditions
- Use sacrifice area or track system
- Limit turnout time
- Apply barrier cream before turnout
- Check and treat legs after bringing in
Exercise
- Light exercise can help (improves circulation)
- Avoid deep mud
- Don't overwork if horse is lame
- Hand-walking is often sufficient
Bandaging
When to Bandage
- Severe swelling
- To keep treatment in place
- To protect healing skin
- If vet recommends
Bandaging Technique
- Apply treatment first
- Use non-stick dressing over wounds
- Add padding for cushioning
- Bandage firmly but not too tight
- Change daily or as directed
- Check for rubbing or slipping
Warning: Incorrect bandaging can cause more harm than good. If unsure, ask your vet or experienced person to show you.
Recovery and Aftercare
Signs of Improvement
- Reduced swelling
- Less heat and pain
- Scabs drying and falling off naturally
- New hair growth
- Improved soundness
- Pink, healthy skin underneath
Preventing Recurrence
- Continue preventive measures
- Don't rush return to muddy turnout
- Maintain barrier cream use
- Monitor closely for early signs
- Address field drainage issues
Scarring and Hair Loss
- Severe cases may leave permanent scarring
- Hair may grow back white
- Scar tissue is more susceptible to future infection
- Extra vigilance needed in these areas
When to Call the Vet
Contact your vet if:
- Swelling extends significantly up the leg
- Horse is significantly lame
- Condition doesn't improve within 3-5 days of home treatment
- Horse develops a fever
- Condition is spreading rapidly
- Horse is in obvious pain
- You're unsure about treatment
- Previous treatments haven't worked
Common Mistakes
Over-Washing
Problem: Strips natural protective oils, damages skin barrier
Solution: Wash only when necessary, dry thoroughly
Leaving Legs Damp
Problem: Creates perfect environment for bacteria
Solution: Always dry legs completely
Ignoring Early Signs
Problem: Allows condition to worsen
Solution: Act immediately at first sign
Inconsistent Treatment
Problem: Prevents healing, allows recurrence
Solution: Follow treatment plan religiously
Returning to Mud Too Soon
Problem: Immediate recurrence
Solution: Wait until fully healed and conditions improve
Products and Treatments
Preventive Products
- Barrier creams (Sudocrem, petroleum jelly, specialist products)
- Turnout boots
- Leg wraps
Treatment Products
- Antibacterial washes (dilute chlorhexidine, iodine)
- Antibacterial creams and sprays
- Purple spray (gentian violet)
- Specialized mud fever treatments
- Epsom salts for soaking
Prescription Medications
- Systemic antibiotics (from vet)
- Anti-inflammatory drugs (from vet)
- Prescription topical treatments
Mud Fever vs. Other Conditions
Similar Conditions
- Greasy heel: Similar but often more chronic
- Cellulitis: Deeper tissue infection, more serious
- Lymphangitis: Infection of lymphatic system
- Mites: Can cause similar symptoms
- Fungal infections: Require different treatment
If in doubt, consult your vet for accurate diagnosis.
Final Thoughts
Mud fever is frustrating but manageable with vigilance, prompt action, and consistent care. Prevention is always better than cure—invest time in keeping legs clean and dry, use barrier creams, and manage your fields to minimize mud. If mud fever does develop, act quickly, follow treatment protocols carefully, and don't hesitate to call your vet for severe cases. With proper management, most horses recover fully and can return to normal turnout.
For more seasonal horse care advice, explore our Stable & Sound blog and discover quality horse care supplies.
