I assume you're talking about Ficus elastica of some variety - the usual cause for this is dry air, possibly being too near a heat source, and possibly underwatering. Let the plant dry out a little between waterings ,and then water thoroughly.

I didn't realise that Guest meant guest, thought it was your avatar name! I have a feeling you're unable to make responses to any questions we might ask as a Guest - might be easier if you became a member.