I've got a mare who had a photosensitive reaction last year. She ended up with some scabby irritated spots on her white markings. We had some blood tests done, and she showed increased liver enzymes. She's since healed up and is healthy. I am wondering what her risk is going forward. Is this likely something that will be a problem with her? I think what caused it last year was her grazing some weeds during a photo session. She was in a dry lot last summer and gorged herself on anything green whenever she got the chance. I'm thinking the likeliest culprit was kochia. So... my new place is full of kochia. I sprayed the pastures and paddocks yesterday and am going to have a fair kill, but is this something I need to worry about? Is this likely a freak thing or a genetic thing? I also have her dam and half sister (who is 2.5 months old.) I am planning to turn the three of them out on the paddock.