Many years ago, I rode a bay horse with a saddle
that fitted me, but obviously did not fit the horse. After a 50-miler, I
removed the saddle and a large oval welt formed on his left shoulder. It
was still there the second day (of a 5-day ride) and on the third day I packed
up and went home, as the welt was still there. As healing took place, the
skin of the welt became like parchment and gradually came off. Underneath,
the hair was starting to grow back in and when fully re-grown, was white.
It is still white to this day, and I would guess that happened at least 10 or 12
years ago. The spot is about the size of a golf ball, only slightly
elongated.
"...She was laid off in late August and when I
brought her home in October she ..."
As you have already had answered by others, the
length of time white persists depends on the severity of damage. Before
we got OF saddles we had some that went away, and some that were
permanent.
Horse's hair does not grow the same speed all
year. After you do the damage, you have to wait for the hair to grow to
start seeing it. Hair damaged in late spring will not be growing until
late summer, so you will see it then. Your timing is such that it could
have been anytime since spring.
Ed
Ed & Wendy Hauser 2994 Mittower
Road Victor, MT 59875