Itchy, red, bumpy rash on finger?

I've had a rash that is about 1 inch long on one of my fingers, just beneath my nail (not under). I've had it for about three months now - there are tiny skin colored bumps, and the skin is hardened and extremely itchy and dry - it appears raw now, as it is shiny. It sometimes becomes swollen, especially after washing my hands. If I scratch it repeatedly, it weeps a clear fluid. I have tried various ointments, including anti-fungal ones, but they only seem to dry it out, which makes it even itchier. What could this be? It does not seem to be severe enough to be psoriasis or eczema...