They Found A Liver Hemangioma 7 Years Ago Measuring 4.3

They found a liver hemangioma 7 years ago measuring 4.3 x 3.2 x 2.2 cm....I had another ultrasound last month and my Dr. Told me today that I have another one 2.1 x 1.8 x 1.7 cm. He told me there is nothing to be done with this and not to worry about it, it's benign. But what if I keep having more? I would like your opinion on this. Thank you. Gisele