In reply to phja:
It probably is from crimping, unless you crushed it somehow on an edge.
Taping is only useful when it stops you from crimping. This partly explains why
http://drjuliansaunders.com/tape-and-other-catastrophies/
Basically, tape is not strong enough to support the pulley in its role of stopping the tendon from bowstringing. The tendon moves 0.2mm outwards from the finger if I remember rightly and is stopped from going further by the pulley. Tape cannot hope to help.
Climb openhanded on slopers and big holds, avoid crimps and edges which rest on the pulley. Stop when it hurts, Rest and Ice, all will probably be well in a month or two.
Best of luck, remember this is internet advice, all from personal experience and research