Bizarre skin discoloration?

Question

He is a palomino gelding and for some reason the skin under his hind legs & tail/around his sheath has become discolored. Like instead of the normal grey, it has white spots. It looks like the coloring of an appaloosa's skin to a degree. It is not causing discomfort or itching. The amount of spots seems to be growing. He is purebred, registered, DNA tested morgan and ten years old. Is this something to be concerned about? What is causing it?

Sorry, no photos yet.

Answer 1

Light colored horses often develop patches of white or pink skin- they can come and go with the seasons or with age and are usually nothing to worry about.  It can happen in any breed, it's just most common in appaloosas and on gray, dilute, or white horses.  Just watch for any sort of peeling, ooziong, or lumps or growths that could indicate an infection or cancer or tumor.

Next time your vet sees the horse for routine work, let the vet look at it and ask an opinion.  Then you'll know for sure.

Answer 2

it could be rainrot, but that usually turns black. I'd check with your vet just to make sur.  

Answer 3

My beautiful, bay mare started getting a few white spots. They seem to appear in high sweat areas, behind the front legs in the girth area. headstall area, etc. My vet said sometimes, it is a copper deficiency. I started a supplement with copper and use feed  where copper gets more than just "an honorable mention".They went away until I tried to use a feed with lower copper levels. The spots have come! And switching back to the higher quality feed and increasing the supplement, has NOT helped.