Sunburn and Photosensitization in Geese

Sunburn in geese is skin injury caused by ultraviolet light. It is most likely to show up on areas with less feather coverage, pale skin, healing wounds, or skin already irritated by moisture, parasites, or trauma. Mild cases may look like simple redness and tenderness. More severe cases can become swollen, crusted, or raw.

Photosensitization is related, but it is not the same thing as ordinary sunburn. In photosensitization, a light-reactive compound in the body makes the skin much more sensitive to sunlight. Merck Veterinary Manual notes that lesions are most common on unpigmented skin with frequent UV exposure, and that photosensitization can happen after exposure to photodynamic plants or secondary to liver problems that prevent normal excretion of phylloerythrin.

In geese, this means your vet may think beyond the skin itself. A goose with painful sun-exposed lesions may also need evaluation for plant exposure, moldy or contaminated feed, or liver disease. The good news is that many primary cases improve well when the goose is protected from sunlight and the underlying trigger is removed.

Because geese are prey animals, they may hide discomfort until lesions are advanced. Early attention matters. A goose that is still eating and acting fairly normal can still have painful skin damage that deserves prompt supportive care.

Ordinary sunburn happens when exposed skin receives more UV radiation than it can tolerate. Geese are somewhat protected by feathers, but they can still burn on less protected areas or on skin that is inflamed, injured, or poorly pigmented. Long hours in intense summer sun, limited shade, reflective surfaces, and recent feather loss can all increase risk.

Photosensitization has a different mechanism. Merck describes primary photosensitization as exposure to a photodynamic agent that is eaten, absorbed, or otherwise taken into the body. In production animals and poultry, photoactive furocoumarins from plants in the Apiaceae and Rutaceae families are recognized causes, and severe photosensitization has been reported in poultry after ingestion of Ammi species seeds. Other incriminated plant groups include buckwheat, clovers, alfalfa, mustards, and related plants.

Secondary, or hepatogenous, photosensitization happens when the liver cannot properly excrete phylloerythrin, a chlorophyll breakdown product. That means anything causing meaningful liver injury can increase risk. In birds, contaminated feed and some toxins can damage the liver. Merck notes that aflatoxicosis in poultry primarily affects the liver, so your vet may ask detailed questions about feed storage, mold, damp grain, and recent diet changes.

In real-world backyard settings, more than one factor may be present at the same time. A goose with pale skin, strong sun exposure, and a questionable pasture or feed source may develop more severe lesions than expected from sunlight alone.

Diagnosis starts with a hands-on exam and a careful history. Your vet will look at where the lesions are located, how deep they are, whether they are limited to sun-exposed areas, and whether other flock members are affected. They will also ask about pasture access, weeds, ornamental plants, feed changes, mold exposure, recent illness, and how much shade is available.

Merck notes that suspected photosensitization should prompt evaluation of hepatic function. In practice, that may mean blood work if feasible, plus assessment for dehydration, infection, and liver injury. Your vet may also recommend cytology or culture if lesions are draining or infected, and in some cases biopsy or necropsy of severely affected tissue if the diagnosis is unclear.

Diagnosis is often partly clinical, especially in backyard geese. A goose with painful lesions on sun-exposed skin that improves after strict shade and removal from suspect plants strongly supports the diagnosis. If the goose also has systemic illness, your vet may broaden the workup to include liver disease, toxin exposure, parasites, or other skin conditions that can mimic sun injury.

Because poultry and waterfowl medicine can vary by clinic, your vet may tailor diagnostics to what will most change treatment decisions. That is a practical Spectrum of Care approach and can still provide meaningful, evidence-based care.

Prevention starts with environment. Geese should always have access to reliable shade during the brightest parts of the day, especially in summer and in open pens with little natural cover. Shade cloth, shelters, and access to cooler resting areas can reduce UV exposure. Pay extra attention to birds with pale skin, healing wounds, feather loss, or chronic skin irritation.

Pasture and feed management matter too. Walk grazing areas regularly and remove or fence off suspect plants, especially if you are unsure what is growing after rain or seasonal changes. Store feed in a dry, clean, rodent-resistant area and discard feed that smells musty, looks clumped, or may have gotten damp. Because liver injury can set the stage for photosensitization, preventing toxin exposure is an important part of skin health.

Routine flock observation helps catch problems early. Check for redness, swelling, crusting, unusual preening, and changes in appetite or behavior. If one goose develops suspicious lesions, review the whole flock's access to sun, plants, and feed before more birds are affected.

If your geese free-range, ask your vet which local plants and environmental risks are most relevant in your region. That conversation can be more useful than a generic plant list, because risk varies by geography, season, and management style.