Looks very similar to some of my buds in early flowering, at a guess, i dont think it is hermying just normal growth. Give it a few days and post another pick????? Here is the best pic I can find showing new growth on top of older growth, yours looks more like the stem growing out of the top of the bud so that it can get longer as well as fatter, Look carefully at my pic and you can see about 3 or 4 areas where the flower is actually getting bigger but look specifically at the very top, it is growing taller with new flowers kindof. Hope that helps.