Julie, is the tip of that growth open enough to let you look at the inside, at the other side of the mound? If there's not a critter in there, did you recently move the plant into more direct light? The new growth is looking a little yellow at the tip, and pinkish on the second sheath down from the top. That kind of coloring usually indicates too much light too quickly, and the spot might be a burn blister, with a secondary infection setting in from the burned tissue and spreading.
There's going to be no way to really fix it without cutting that part away, but if you do it carefully and sprinkle cinnamon on the cut part, bloom shouldn't be affected.
We pull the shadecloth off the greenhouse here for winter, and while we were gone over Christmas, it snowed. The sun came out a day later and stayed out for several days while temps remained below freezing, and all that reflected light burned the leaves on several plants here. If there's snow on the ground where you are and the sun comes out, be wary of the same kind of situation occuring--intense, reflected sunlight coming in through a window, possibly while you're away.