Why does my old scar do that???

... I was probably 16. I went into the clinic and all I got was, "If it doesn't go down, we can schedule a plastic surgery to remove the scar tissue." And since it went down the next day I didn't worry about it. This has happened about 5-10 times since ...

http://ask.metafilter.com/250627/Why-does-my-old-scar-do-that