Rainscald (also called rain rot or dermatophilosis) is caused by the same bacteria that can contribute to Mud fever - Dermatophilus congolensis. It is a skin infection that can appear on horses backs, if they're left out in wet weather. It is more commonly seen in the winter months when the horses' coats can remain wet for long periods of time. The bacteria get into the soft wet skin on the back, causing the skin to weep, become flaky and crusted, and the coat to matt. Longer coats may not help the situation.
Look out for clumps of hair and rough, raised bumps on the back that develop into painful-looking, crusty scabs. Once removed, scabs leave red, sore-looking skin underneath.
Make sure the horse isn't subjected to prolonged periods outside in rain and wet conditions.
Keep the horse inside, until the skin has healed. Remove the horse from wet, muddy conditions. Scabs can be gently removed and antiseptic washed containing chlorhexidine or iodine used. The veterinarian may administer oral antibiotics/penicillin and supplements. The stable should also be kept as clean as possible. You can also use dawn or M-T-G.
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