Hemangioma's do grow..There are different kinds, and different reactions. Some are flat, some swell, some "move" all over the skin, other's remain in one place.. they all seem to have a life of their own.
.....Vascular malformations also may look blueish in color..they "swell and become raised"......some get reddish color on them, other's don't. Unfortunatley if you see something new,,it is moe then likely not a hemangioma, but another vascular malformation.. I'd definitley let Dr. Cohen know...and as soon as possible, so he can keep an eye on it.