Itchy horse: veterinary diagnosis and solutions for equine dermatitis

Your horse is constantly scratching: what to do?

Watching your horse frantically scratch against posts, trees, or walls is a worrying situation for any owner. This behavior, far from being trivial, is often a sign of a skin condition that requires special attention and, in many cases, the intervention of a veterinarian.

Excessive scratching can have multiple causes: allergies, parasites, infections, nutritional imbalances, or dermatological conditions. Understanding the origin of the problem is essential to provide effective treatment and long-lasting relief for your horse.

Main causes of scratching in horses

1. Recurrent Equine Seasonal Dermatitis (RESD)

The most common cause of intense scratching in horses is summer dermatitis, an allergic reaction to culicoides (small midge) bites. This condition affects 5 to 10% of horses and is characterized by:

• Intense itching, mainly at the base of the mane and tail
• Seasonal occurrence (spring-summer)
• Annual recurrence with progressive worsening
• Skin lesions due to scratching (hair loss, scabs, wounds)

2. External parasites

Lice: cause itching, especially in winter, visible to the naked eye or with a magnifying glass.

Mange: caused by microscopic mites, leads to intense itching and crusty lesions.

Ticks: can cause localized irritation and transmit diseases.

Flies and horseflies: their bites cause local reactions and scratching.

3. Skin infections

Dermatophytosis (ringworm): fungal infection causing circular hairless areas, sometimes itchy.

Bacterial infections: folliculitis, pyoderma causing inflammation and itching.

Mud fever: dermatitis of the lower limbs caused by bacteria and fungi in wet environments. Consult our complete guide on horse mud fever.

4. Allergies

Food allergies: reactions to certain food components.

Contact allergies: reaction to bedding, care products, equipment.

Urticaria: swollen and itchy plaques appearing suddenly.

5. Other causes

• Dry skin: dehydrated and irritated skin
• Nutritional imbalances: deficiencies in fatty acids, vitamins, minerals
• Stress: can trigger or worsen scratching
• Liver problems: can manifest as itching

Veterinary investigation: diagnostic steps

Step 1: Anamnesis (history)

The veterinarian begins by collecting detailed information:

• How long has the horse been scratching? Recent or chronic onset?
• Seasonal? Spring-summer (summer dermatitis) or all year round?
• Affected areas? Mane, tail, body, limbs?
• Intensity of pruritus? Mild, moderate, intense?
• Evolution? Stable, worsening, improving?
• Treatments already tried? Efficacy?
• Environment? Stable, paddock, pasture, proximity to wet areas?
• Diet? Recent changes?
• Other horses affected? Possible contagion?
• Breed and history? Genetic predispositions?

Step 2: General clinical examination

The veterinarian assesses the horse's general condition:

• Temperature, heart and respiratory rate
• Body and nutritional status
• Behavior and stress level
• Examination of mucous membranes and lymph nodes

Step 3: In-depth dermatological examination

The veterinarian meticulously examines the skin:

Location of lesions: affected and unaffected areas (important diagnostic indicator).

Type of lesions:

• Papules (small bumps)
• Vesicles (blisters)
• Crusts and scales
• Hair loss (alopecia)
• Skin thickening (lichenification)
• Scratch wounds
• Secondary infections

Appearance of the skin: dry, greasy, inflamed, thickened.

Presence of parasites: visual search for lice, ticks, nits.

Step 4: Additional examinations

Depending on the observations, the veterinarian may perform:

Skin scrapings: collection of scales and crusts to look for mites (mange) under the microscope.

Trichogram: examination of hairs under the microscope to detect anomalies or parasites.

Fungal culture: culturing to identify dermatophytosis (ringworm).

Skin cytology: examination of cells to identify bacterial or yeast infections.

Skin biopsy: collection of skin for histological analysis in complex cases.

Allergy tests: identification of responsible allergens (intradermal or blood tests).

Blood tests: general check-up, search for metabolic or liver disorders.

Step 5: Differential diagnosis

The veterinarian establishes a list of possible diagnoses and progressively eliminates them through examinations, until the exact cause of the scratching is identified.

Veterinary treatments according to the cause

Treatment of summer dermatitis

Corticosteroids: reduction of inflammation and pruritus, but side effects (laminitis, immunosuppression) limit prolonged use.

Antihistamines: variable efficacy in horses.

Immunotherapy: progressive desensitization by allergen injections, long-term results.

Physical protection: anti-insect blankets, masks, repellents.

Environmental management: stable during culicoides activity hours, avoid wet areas.

Parasite treatment

External antiparasitics: shampoos, sprays or specific powders depending on the parasite.

Ivermectin: effective against certain mites.

Environmental treatment: disinfection of equipment, bedding, stables.

Infection treatment

Antifungals: for ringworm (topical or systemic).

Antibiotics: for bacterial infections (local or general).

Antiseptics: cleaning and disinfection of lesions.

Allergy treatment

Allergen avoidance: identification and removal of the cause.

Dietary change: elimination diet for food allergies.

Environmental modification: change of bedding, care products.

Complementary and natural approaches

Therapeutic ozone: a valuable ally

In addition to veterinary treatments, ozone offers a natural solution to relieve itching and promote skin healing.

Anti-inflammatory action: reduces inflammation and pruritus, quickly relieving the horse.

Antibacterial and antifungal properties: prevents and treats secondary infections of scratch lesions.

Healing effect: accelerates the repair of wounds caused by scratching.

Strengthening the skin barrier: improves skin resistance to aggressions.

Practical applications:

• OZONE SKIN CARE: ideal for summer dermatitis and skin irritations
• INTENSIVE OZONE CARE: for scratch wounds, secondary infections, severe lesions

Usage protocol:

1. Gently clean affected areas
2. Dry thoroughly
3. Apply ozone care generously
4. Repeat 1 to 2 times a day depending on severity
5. Continue as a preventative 2-3 times a week

Food supplements

• Omega-3: anti-inflammatory properties for the skin
• Biotin and zinc: support skin health
• Vitamins A and E: protective antioxidants
• Depurative plants: nettle, burdock, wild pansy

Stress management

• Calm and stable environment
• Regular routine
• Adapted exercise
• Balanced social life

When to consult a veterinarian?

Consult quickly if:

• Scratching is intense and constant
• Skin lesions appear (wounds, scabs, hair loss)
• The horse loses weight or changes behavior
• Scratching persists despite basic care
• Several horses are affected (suspected contagion)
• General signs appear (fever, lethargy)
• Lesions worsen or become secondarily infected

Early diagnosis allows for more effective treatment and prevents complications.

Prevention of scratching and dermatitis

Hygiene and environment

• Clean and dry stalls, regularly changed bedding
• Paddock drainage, avoid muddy areas
• Clean and disinfected equipment
• Manure management away from horses

Insect protection

• Anti-insect blankets and masks
• Natural or chemical repellents
• Stable during peak insect activity hours
• Fans in stables

Balanced diet

• Ration adapted to the horse's needs
• Supplements for skin health if necessary
• Clean, fresh water constantly
• Avoid excess protein and sugar

Preventative skin care

• Regular grooming to stimulate circulation and detect problems
• Gentle, suitable shampoos
• Preventative application of ozone care 2-3 times a week
• Regular monitoring of skin condition

Veterinary follow-up

• Regular examinations
• Adapted deworming
• Up-to-date vaccination
• Preventative treatment for at-risk horses (summer dermatitis)

Clinical case: example of a veterinary investigation

Presentation

Luna, an 8-year-old Friesian mare, has been intensely scratching the base of her mane and tail for 3 weeks (early May). The lesions are worsening despite the application of repellents.

Anamnesis

• Seasonal appearance (spring)
• Characteristic areas (mane, tail)
• Paddock near a pond
• Predisposed breed (Friesian)
• No other horses affected

Clinical examination

• Good general condition
• Localized lesions: base of mane and tail
• Hair loss, scabs, scratch wounds
• No visible parasites

Diagnosis

Recurrent Equine Seasonal Dermatitis (RESD) - clinical diagnosis based on typical presentation.

Treatment

1. Protection: full anti-insect blanket
2. Management: stable at dawn and dusk
3. Local care: OZONE SKIN CARE twice a day
4. Supplements: omega-3 and depurative plants
5. Follow-up: re-evaluation after 2 weeks

Evolution

• Week 1: 50% reduction in scratching
• Week 2: wound healing, regrowth beginning
• Month 2: satisfactory control with preventative maintenance

Conclusion

A horse that scratches excessively requires a methodical veterinary investigation to identify the exact cause and implement appropriate treatment. The veterinarian, like a detective, gathers clues (anamnesis, clinical examination, additional examinations) to solve the diagnostic puzzle.

Summer dermatitis remains the most common cause of intense scratching in horses, but many other conditions can be responsible: parasites, infections, allergies, nutritional imbalances.

Treatment depends on the diagnosis and often combines several approaches: veterinary medications, environmental management, physical protection, and complementary natural care. Therapeutic ozone, thanks to its anti-inflammatory, antibacterial, and healing properties, is a valuable ally in relieving pruritus and promoting skin healing.

OZONE SKIN CARE and INTENSIVE OZONE CARE products offer a natural and effective solution, usable in addition to veterinary treatments, to improve your horse's comfort and accelerate the resolution of skin lesions.

Prevention remains the best strategy: rigorous hygiene, insect protection, a balanced diet, and regular monitoring help limit risks and intervene quickly at the first signs.