Yes DD has one in the crease of her nappy line. She was prescribed a medication called Timolol to shrink and fade the mark. It's actually an eye medication but a side effect is it shrinks and fades birth marks. She's now 8 months old and it's half the size it was originally. Have you seen a pediatrician?
If you are in Melbourne I can recommend one with lots of experience in hemangiomas. Internal medication is also available to treat them.