2 holes appeared in the bum part a few days ago - he said that there was something sharp sticking out of his mattress which he had to keep pushing down that might have caused them (no idea why he hadn't mentioned this before
) so DH had a good look and there was nothing there.
Anyway, a day later - 5 big holes have now appeared in one of his knees of the same trousers (he is waiting for some new ones to arrive which is why he is still wearing them).
They are relatively new, from Next so reasonable quality and they don't look like they are wearing through. I am a bit baffled but obviously don't want him to wear new ones in bed until I work out what it is 
Do bed bugs eat clothes???