Hi, i have discovered a small, soft black growth on the right hand side of my pony's withers (right at the top, not where the saddle touches). It is soft and moist to touch and is round in shape, its slightly raised from the skin. It looks a little like a raisin. My mare is a welsh x and is 3 1/2 years old. Does anybody have any idea at all what this could be. It did not bother her one bit when i was touching and looking at it.