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Zuko has lightning scars
But not just on his chest. Everytime he redirects lightning the current going through his fingers, down his arms, across his body and out through his other hand is so great that it leaves nerve damage on the tips of his fingers, where the the lightning enters his body.
And with this nerve damage comes small thin and long scars that run down his fingers and along his forearms before they begin to fade. I just think it's a really cool character design, especially with the colour of his lightning scars ( the one on his chest would look like a starburst of white instead of the reddish hue after it heals properly) and that scar on his chest also spans out to a larger area.
Everytime he redirects lightning bc azula is cray cray the tips of his fingers become a harsh red temporarily and steam rolls off of his body as he cools down. His hair becomes frazzled from the amount of electricity he's holding.
There's so much more character design potential with zuko. I love it when I see artists draw zuko with more scars other than the ones his face and chest.