Sunburn & Photosensitivity in Horses: Causes, Symptoms, Prevention & Treatment
Here’s a barn-smart guide to protecting light-skinned and photosensitive horses when the sun is working overtime. We’ll cover the difference between simple sunburn and true photosensitization, what to do today, how to prevent the next flare-up, and where Draw It Out® products fit—always on clean, intact skin and as part of a vet-guided plan.
Sunburn vs. Photosensitivity—What’s the Difference?
Simple sunburn happens when UV radiation directly damages unpigmented skin—think pink noses, around the eyes of blazes, white socks, and clipped backs. It shows up as redness, heat, tenderness, swelling, and later peeling.
Photosensitivity (photodermatitis) is an exaggerated reaction to UV light. It can occur when a horse ingests photodynamic compounds (primary photosensitization) or when liver dysfunction allows normal chlorophyll by-products (phylloerythrin) to build up (secondary photosensitization). The result can be more severe, widespread skin damage—oozing, crusting, reluctance to go outside, and lesions beyond just pink areas.
- Plants: St. John’s wort, buckwheat, alsike clover; plus liver-injuring plants like ragwort and lantana that set up secondary photosensitivity.
- Medications: some antibiotics (tetracyclines, sulfonamides) and select drug classes. Always ask your veterinarian about sun sensitivity with any new prescription.
Dew poisoning is a colloquial term for photodermatitis on lower limbs in wet, sunny conditions—often overlapping with pastern dermatitis. It’s distinct from a simple, localized sunburn.
Symptoms & When to Call the Vet
Early sunburn
- Pink skin turns red, warm, and tender
- Mild swelling; later, dry flaking/peeling
- Horse may resist haltering/bridling if face is sore
Signs that suggest photosensitization
- Oozing lesions, moist crusts, hair loss across larger areas
- Pain, marked sun avoidance, lethargy, reduced appetite
- Recurring patterns tied to pasture or feed changes
- Oozing/crusting lesions, spreading damage, or significant pain
- Fever, lethargy, or signs of systemic illness
- Repeated episodes (ask about liver enzymes and diet review)
First Aid & Relief (Today)
- Shade now. Move the horse indoors or under solid shade.
- Cool water rinse. Rinse gently; avoid ice-cold blasts. Pat dry—don’t rub.
- Keep skin clean. Bathe as needed to remove irritants and residue. Gentle, frequent grooming supports recovery—just rinse thoroughly.
- Vet guidance. For moderate to severe cases, your vet may recommend anti-inflammatory medication and diagnostics if photosensitization is suspected.
Where Draw It Out® fits (comfort on clean, intact skin)
Rapid Relief Restorative Cream
Non-greasy comfort on clean, intact skin—easy, smooth coverage for sore, sun-irritated areas.
RESTOREaHORSE® Liqui-Gel Salve
Stay-put, liqui-gel salve that clings where you need it. Apply to clean, intact skin only.
Draw It Out® 16oz Gel
Target tight, sore muscles that accompany sunburned backs or shoulders. Show-safe and sensation-free.
ShowBarn Secret® Skin & Hair Enhancer
Replenishes moisture and supports the skin barrier between rinses as you groom through recovery.
Important: Apply only to clean, intact skin. Do not apply to open wounds or infected areas. Always follow label directions and your veterinarian’s advice.
Prevention That Actually Works
- Shade strategy: Provide reliable shade and adjust turnout to early morning and late evening.
- Physical barriers: UV fly masks and UV-protective sheets are your best friends for pink skin and light coats.
- Equine-safe sunscreen: Use on pink muzzles and around eyes as directed; reapply after rinsing or sweating.
- Pasture management: Walk your fields for photosensitizers (see list above). After storms or mowing, recheck.
- Clean environment: Reduce irritants and residues in stalls, trailers, and gear with SuperClean™.
- Bug pressure: Limit secondary irritation with Citraquin® Environmental Defense Spray.
- Groom often—rinse thoroughly: Regular ShowBarn Secret® shampoo, conditioner, detangler, and Enhancer help maintain a healthy coat. Rinse completely to avoid build-up.
Long-Term Management
- Turnout timing: Commit to AM/PM turnout during high-UV months.
- Diet review: Audit feed and supplements for potential photosensitizers; discuss with your vet or nutritionist.
- Liver health: In recurrent cases, ask your vet about bloodwork (liver enzymes) and regional plant risks.
- Seasonal checklist: Add a UV gear + sunscreen + Citraquin® + SuperClean™ line to your spring/summer prep.
Quick FAQs
Can dark-coated horses burn?
Yes—especially where skin is pink (markings) or hair is clipped short. Photosensitization can affect any coat color.
Is zinc oxide safe for equine noses?
Equine-safe zinc oxide products are commonly used on pink muzzles. Prevent ingestion and follow the product label.
How often can I bathe a sunburned horse?
Gentle, frequent rinsing and bathing to remove sweat and irritants can help; just avoid harsh scrubbing and rinse thoroughly.
Do Draw It Out® products contain tingling agents?
Our liniment gel is sensation-free and show-aware. Always follow the label and your show’s rules.
