My daughter had one that grew steadily starting at 5 weeks. She had a deep/surficial mix. Like you, I reached the internet and freaked out because of the pictures. They put worse case on there, not ones that grow and stop. My daughters grew to smaller than a dime when it peaked and then started to involute at about 9 months old. She is 16 months old now and the deep one is gone and the middle red is gone so now she only has the red (really pink) left outer circle. it is at her hairline so I gave her bangs. She also had one on her torso that is almost completely gone.
I went to a specialist and they really put my mind at ease. I put Timilol on for 2 months, not sure if stopped it from growing but I think it helped.