This common condition has many complex-sounding names. It is the most common skin condition that presents as multiple small lumps and bumps and it is most common over the back and withers. These are hard, pea-sized bumps under the skin, with no hair loss in most cases.
The cause of this disease is not entirely understood. It is an inflammatory, hypersensitivity-like disease. It is more common in spring and summer and insects allergy may be involved. Because of the common location, under the saddle, and the fact that it is more common in ridden horses, it is thought that pressure from the saddle may be a factor.
Diagnosis is often made just by the typical appearance of the condition, i.e. multiple small firm bumps along the skin of the back and withers. But definitive diagnosis requires biopsy and submission to the laboratory.
Treatment is usually injection of steroids under the bumps, or surgical removal.
Other Diagnoses Considered
Treatments May Include
Prognosis & Relevant Factors
The prognosis is good. The nodules don't usually cause the horse much problem, although large ones can become painful under the saddle.
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QUESTIONS TO ASK MY VET