http://en.wikipedia.org/wiki/Yeast_infection
Very common, like Athletes foot of the knacker. Daktarin, without prescription will rid it in a day or so.
Ingrowing hair. Are you quite hairy down there? Look in a mirror, there will be a little pimple where the hair has grown back in to itself. May be hard to spot in the old walnut folds, mind. Can be plucked, or more picked out without any discomfort. Just use a sterilzed pin. . Just make sure you have a steady hand.
Also just get some sanex neutral shower gel.