Get your iFern out and snap a picture of the offending nail.Vaguely remember ScouseD saying he had troubles with splitting/bleeding fingers a while back.
it could be something fungal, although it doesn't look quite cracked and sore enough to me
Tea tree oil will be good for anti germy fungal stuff too
get some cotton gloves to wear overnight a couple of times a week
I bet you'd have managed to be a touch more concise about it too.