I would have to agree. This looks very much like a segmental hemangioma. My son's appeared sooner than you describe, but in the same way. Did you happen to notice a white halo around the area that eventually develped the vascular lesion? Just a common sign of a hemangioma developing.
Have you noticed the h. start to gray in color? I know you may have some trouble in Canada getting tx., but laser is a common why these are treated in the U.S.
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