Hi Katherine,
When my son was 8-weeks old, we noticed a slight blush on his cheek that appeared to be stiff to the touch. I took him to his pediatrician, who referred us to a specialist at Children's Hospital of Los Angeles. The doctor we saw there basically told us not to worry about it - let it go away on its own. I was not satisfied with this diagnosis, and so I went to Children's Hospital of Orange County instead. What a difference! There, my son was given a comprehensive exam and we just felt like the doctors there were more sensitive to our concerns and gave us more information. Long story short...he ended up being referred to an ENT, hematologist, ophthalmologist, and laser specialist. By that time, the mass had grown larger, and up into his eye, nearly sealing it shut. A diagnosis of venous malformation and hemangioma were given to us, though I think at this point, it's closer to a hemangioma.
My son is now almost 2 years old, and has throughout the years been put on steroids, propranalol, and had laser treatments and MRI's. The hemangioma is starting to go away, and the treatments he's received have definitely helped.
I'm not sure what the severity of your son's hemangioma is, but, if it starts to interfere with other functions (like my son's did - pressure on nasal passage, eye pressure, etc.) then I would strongly encourage you to get a second opinion.
Hope this helps! Feel free to message me if you need more info!
~R.