Terrapin scratching constantly

by jon
(glos)

My 4 year old red bellied terrapin keeps scratching and staying out of the water for long periods. it seemed to start when i bought a new lamp, i was sold one that was supoposedly suitable but it wasn't a uv 10.0 one. i have the correct lamp now, it was about a month before i got the new 10 lamp. he does have a sore patch on his soft skin where he has been moving alot.