Finally heard back from Sullivan vet. Primary Photo Sensitization is what they are diagnosing it as. No sun for a couple weeks...I guess I'll stall her during the day and let her out at night. I'm doing loads of research and apparently certain plants can cause it (clover which is in the field), certain chemicals (I just bought new fly spray) and certain meds from vets (she had all the newborn shots). Process of elimination. I'm relieved they are thinking primary vs secondary. Secondary is an ailment involving the liver where primary is based off something ingested.
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This foal is only 11 days old correct? Do you know what shots or vaccines were administered to her, and have you told your vet about them? The majority of vaccines are not labeled for use in foals under 90 days, and some not even until 6 months. Giving them earlier than 90 days in usually only done in cases of imminent outbreak where the benefit outweighs the risk. So for anyone reading that didn't already know, this is why the mare is boostered prior to foaling.
Was an IgG test performed on the foal after she was born? If she is having an immune issue caused by environmental or chemical factors, it would have been nice to know that complete passive transfer was achieved. Also, since the mare seems unaffected, you may want to ask your vet if a plasma transfusion might be of any help at this point.
I would put mom on inspected hay only and quit grain & pasture for at least a week just to eliminate as much of the culprits as possible. The foal is really not old enough to do much more than have a little taste of grass, hay, or grain as milk is the main source of nutrition. For good measure, spraying broadleaf herbicide on the pasture to kill any weeds or clover might also be worthwile. The dirt in your drylot could also be irritating. Maybe try some bagged shavings or clean straw in the area the foal likes to sleep.
I hope you find out what is causing the trouble!