Is My Old Scar That Continues to Grow Hypertrophic or Keloid?

I had this scar due to a minor bicycle accident 8 years ago. Problem is, I believed it to be a hypertrophic scar, but it keeps on growing, and now that I'm 19, it is larger, way larger than the scar I had 8 years ago. My brother had the same scar on his knee, but his flattened, mine did not. I'm wondering what's the cause of the growing scar? And how to stop it from growing.

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