When summer becomes torture – summer eczema

Summer eczema is a recurring allergic skin disease in horses that manifests itself in severe itching and hairless, open patches of skin. The disease can occur in horses of all breeds, although Icelandic horses, Norwegian horses, Shetland ponies, and Haflingers are significantly more commonly affected, while warmbloods tend to be affected less frequently.

INHALT
Cause Symptoms Diagnosis Treatment Forecast Prophylaxis
Cause

This skin disease is triggered by various blood-sucking insects such as black flies and midges. The horse's immune system reacts to the saliva of these mosquitoes with an allergic skin reaction. Why this hypersensitivity reaction occurs is not yet fully understood. A genetic component is suspected, but has not yet been conclusively proven. There are also several factors that promote the development of the disease. These include lack of exercise and incorrect or excessive feeding.

Symptoms

The first signs of the disease usually appear in spring, when the mosquitoes begin to fly. The most noticeable symptom is severe itching, which causes the animals to become restless and rub themselves, particularly against their tails and manes. The pustules caused by the insect bites are usually not even noticed, as the constant rubbing causes the hair to break off and fall out, leaving open and sometimes weeping areas of skin with crusty coatings. The open and bloody wounds attract further insects, often leading to secondary bacterial infections (infection with an additional pathogen). In addition to the tail and mane, the skin on the back, lower abdomen, and head, especially around the eyes and ears, can also be affected.

Horse with insects and itching
Diagnosis

Due to the seasonal occurrence of the disease, the proximity to certain mosquito habitats and the typical symptoms, the treating veterinarian can usually make an initial clinical diagnosis. A special blood test can be used to determine whether or not it is an allergic reaction to the insect's saliva, thereby confirming the diagnosis.

Treatment

The top priority in treating summer eczema is to keep the allergy-triggering insects away from the horse, as each additional bite leads to increasingly severe reactions and the eczema steadily worsens. This can be achieved simply by changing the location and grazing times. Affected horses should not be kept near standing water and should not be put out to pasture at dusk, but rather at night. Special eczema blankets that mosquitoes cannot bite through and insect repellents can also help.

If skin changes have already occurred, these are treated with itch-relieving and nourishing ointments, lotions, or creams. This allows inflammation to heal and the skin's protective barrier to be maintained. In severe cases, general anti-inflammatory medication is necessary in addition to local treatment. Antibiotic preparations should be used for secondary bacterial infections.

With the help of special desensitization or hyposensitization treatments, the horse's immune system can be accustomed to the allergy-triggering substances, so that the severity of the disease decreases in the long term. However, this immunotherapy should only be carried out by specialists, as it must be tailored to the specific allergen (the substance that triggers the allergy). Talk to your veterinarian about the possibility of desensitization to find out whether this type of therapy is appropriate for your horse.

Horse with eczema blanket
With the help of an eczema blanket, allergy sufferers can enjoy the pasture
Forecast

If contact between the horse and mosquitoes can be prevented as far as possible, the prognosis is good. However, the necessary measures must be taken throughout the horse's life. If skin damage is already present, the timing of treatment determines the prognosis for recovery. Successful hypo- or desensitization therapy can lead to long-term improvement of symptoms.

Prophylaxis

The best preventive measure is to avoid contact with the insects that trigger allergies. As already described, this can be achieved with the help of appropriate pasture management, special eczema blankets, and insect repellent sprays.