Mud fever is without a doubt the most recognisable skin condition in horses. Mud fever is actually a non-specific collection of skin inflammations (dermatitis) that occur primarily in the horse’s pastern. In severe cases it can lead to swelling in the leg and will not heal on its own if left untreated. In extreme cases, mud fever can lead to lameness.

The most noticeable symptoms are redness, scaling, scabs, and cracks to the skin of the pastern. This area is often warm and moist, so that bacteria can quickly multiply there.

Mud fever can be caused by a variety of factors. It can be caused by dirt, mud, insects, or from frequent washing of cracked skin prone to bacterial infections. Fungal infections, scabies mites, and sunburn can also be the causes. When the horse moves, its pasterns are constantly in movement as well. This makes it difficult for the skin there to heal.