Small crack near back button on digitizer or lcd?

[cesar31910]

so i have a small crack at the bottom over my back button. it does not affect functionality or anything, it is not on the glass it is inside im not sure if on the lcd or digitizer. it is probably half an inch across. i was wondering is it ok if i leave it as is and be careful with my phone. i have a otter box for it now. or do you think it will be prone to crack more? do you think it will be ok?