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Hello, I would call this "delayed growth" would be a better way to describe it. I have heard of patients being treated with oral steroids early on (for other health issues, no sign of hemangiomas) and once off the steroid the hemangioma appeared at age 2. Likely the propranolol did delay the growth (appearance) of the hemangioma. Is is possible for them to do a biopsy to know for sure this is a hemangioma? It is important to monitor the growth. I would encourage you to seek an opinion from Vascular Birthmark Experts through this site.