This is one of the stallions here coming 5 and was solid chestnut when l got him as a baby now the past year he's gotten a lot of light hairs throughout on his head and just starting on the back legs and coming in on his back plus l have no idea what or where he got the white spots there's a few now at first when l saw the one in the picture is wasn't that big this happened in the past 2 weeks one on his side the others between his front legs. l though ringworm but it isn't and doesn't look like an old injury grown over either. Color dummies here any ideas...l call him my sorrel man all looks the same to my eye.