First of all, welcome to Janet Emery via Bloglovin.
For years, I had thought that those little painful splits you get near a fingernail were called whitlow's. Well, I found out the other day they weren't.
I had one forming on my thumb and went off to see what, if anything, could be done to alleviate it and came across this video: here.
You just have to get through the adverts etc - most annoying. Anyhow, it is one of the best explanations of what causes them and how to treat them, not using fingernail polish as some people suggest!
I duly found some Vaseline, smeared it into the painful cut, applied a plaster, both morning and night. By the second night, the pain had gone and the crack was closing. On the third morning the skin had sealed shut - wonderful.
He expalins if you do this asap, before the skin gets really open, you should be able to stop it in its tracks. Now I know the answer, I shall do it as soon as I notice it happening rather than when the crack is deep and painful.
Hope you find this information useful.