light burn?

All my plants are in the same medium get the same nutes at the same time and the same amount, (i water with a measuring cup) this is the only plant out of five with this problem. Over all its a healthy plant minus this problem that just came up

Can't really see anything in those pics... it looks like nothing I'd worry about, def not light burn.

Cant see the yellow on the edge of the leaf? It has now spread to a couple other leafs too