Do you have any noticeable marks on your fingers caused by the string being attached?
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look up the WIRED interview for gentry stein, he shows off his throwhand callus there and its quite gnarly.
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I always have string burn on 3 fingers
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Definitely. Calluses on my fingers from where the strings always glide across and sit. I have a couple of scars from gnarly string burns too haha!
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Bump on the head.
i feel like learning double or nothing is what scarred me for life, now i forever have perfect yoyo string grooves on the inside of my index lol
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I was looping fixed axle with my hands behind my back.
And now I have a string burn around my neck🤡
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I tape to avoid the string burns. ;]
Yes I have something on my body caused by yoyoing. It’s a most wonderful condition where the corners of my mouth turn upwards, forming a huge smile. I often must put the yoyo down due to facial muscle fatigue. 
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