I have only once heard of one been removed. In my experience as a CFHN they just leave them.
The one I heard of removed (I saw it before they removed it) was so large poor bub was going into cardiac failure. I took up most of the top of his leg from the knee to the hip so his heart was having a lot of trouble pumping blood as it was taking up so much.
Mostly the ones I have seen have been small on the elbow or face and go away very slowly over time. They may get bigger initially and then start to fade and shrink. My niece had one on her face that didn't vanish completely until she was about 10years old.