A couple things come to mind when reading your description. First it appeared to be what sounded like a rapidly involuting congenital hemangioma, but now that you are seeing it grow with him, I would highly recommend that you talk with a hemangioma/vascular malformation expert. I would recommend contacting one of our ask the expert specialist from the home page of this website. (Dr Levitin, is very good about answering email). If you need any help, please let me know.
VBF Director of Family Services
vbfadvocate @ live. com (no spaces)