Why is an old scar on my knee turning colors since I got a knee injury?

I got a scar on my knee when I was secen going down a steep hill on my bike. I am 23 now and have recently gotten a knee injury on the same knee. I havent gotten exaclty what is wrong with my knee yet from my doctor, but it’s on the lines of an ACL injury or a torn tendon. My kneecap is part of the injury and has been hurting and I’ve noticed that my old scar (that has been a light pink color for years) has been turning colors. First its red and kin dof looks like it has red scratch marks on it, then it turned a dark color like brown. What is happening here? How is my knee injury affecting my old scar? Should I be worried about anything?

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