Marks On The Leaves

Sunburn this is not going to kill your plant but in most cases your plant will keep these damaged leaves you will have to relocate the plant and wait for pups to develop as replacement plants. If only small amount of sunburn just remove leaves just below burn mark and relocate to more shade

cold weather leaf marks the only thing you can do is grow under cover or in a more sheltered area

Bellow is hail damage

you can also have marks from leaves from trees falling on top of your plant and this stops the sun colouring the leaf of your Bromeliad