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Hi there, vet Andrew here. I have been away and unable to log on for a few days - I'm sorry no-one has answered your question, but I am able to now if you like. Please let me know if you want an answer by replying here. Many thanks.
From your initial post I assume Tita is not scratching the areas, and that the skin exposed in the patches looks normal. Is this correct?
Have you seen Rainscald before?
OK. Rainscald can be patchy and even follow the run-off pattern of water when a horse is out in the rain. The proper way to approach this is with a vet visit, full examination, skin scrapes and biopsies. However, this can get complicated and expensive very quickly. To rule out rainscald and fungal/bacterial infections, pick up a bottle of Imaverol shampoo from your vets and wash as directed to rule out ringworm. Malaseb can also be effective, especially against rainscald. If the lesions fail to improve in two weeks or worsen, it's time for a vet visit.
Another possibility is alopecia areata, which is a non-infectious immune disorder causing hair loss, although usually circular. It comes and goes and does not require treatment.
Have you any further questions?
Definitely. The organism likes moist conditions, so correcting the underlying cause is as important as treating it.
I hope all goes well for you and Tia. Best wishes, vet Andrew.