Equine Rain Rot

The bacteria that causes this skin condition, Deramtophilus congolensis, has the characteristics of both bacteria and fungi. It thrives in wet weather when the skin is waterlogged.

What are the symptoms?
Rain scald results in the formation of matted scabs usually affecting the back and rump but occasionally the lower limbs. Removing these mats and scabs is painful and can cause raw, bleeding, irritated areas.

Where does it come from?
The bacteria live in the soil and generally cause infections during periods of prolonged wet weather. It is contagious and can be spread to other horses by infected animals. Other contributing factors are poor stable hygiene and skin irritation caused by insect bites.

How is it diagnosed?
It is relatively easy to diagnose. Your veterinarian can take a culture and sent it to a laboratory for testing.

There are other bacterial infections, skin allergies and parasites look similar, so if you're uncertain, contact your veterinarian.

How is it treated?
Horses should be kept dry and protected from biting insects.

The horse should be bathed daily with antimicrobial and antibacterial shampoos and rinses. Softened scabs should be gently removed. If Betadine, Phenol or Nolvasan is used, you should continue applying once a day for one week.

Dermatophilus congolensis grows better without oxygen. Wet hair can help the bacteria grow, so clip the hair coat if it's long and thick.

It is not a good idea to use ointments on rain scald, since they hold moisture to the skin.

Severe infections may require antibiotic treatment.

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