Hoping you can see the pictures!  Has anyone seen this on a pig's leg before?  It is a row of small holes in a differently coloured area of skin on what would be our boar's 'forearm'.  It doesn't seem to trouble him, not even when I was running my fingers over it and stretching the holes open a little bit.  It doesn't look like insect bites and is not hot or weepy.  I can't find any more anywhere else in him or his mate.  I am wondering if they are natural openings like scent glands or something.  If he was at all altered in health or behaviour I would call the vet straight away, but he is just his usual self. 
 
 