the other day my bf came without his heavy gold chain and scratches over is face and fingers, is this something to do with drugs?or fights?

It depends if it looks like he was picking at his face and fingers like it looks like he did it to himself it is most likely an upper drug such as crystal meth or cocaine. Now if it looks like scratches more then picks then it was either he got in a fight or he fell in a bush or fell on something that could scratch him. Usually guy fights don't involve scratching Id look for bruises. It sounds honestly (if it is a scratch and not a pick) like he fell. I wouldn't worry about it too much. Anything could have happend. The possibilities are endless.

Why don't you ask him instead of us?

i he says fighting, but maybe hes lying

ask him