Bug black hand chest black lighting

I downloaded minecraft on my brother's PC and enjoyed, when I created some world and played there. My hand is turning black and my chest too. I quit from the game and returned and nothing happened, I placed torch near me and my chest and it's still glitching. This has been over 3 years and it should be fixed, I'm not going to buy another computer to waste my money and then doesn't work again. Here is the picture: