Out! damn spot

I have a spot on the palm of my hand that is itchy. It's been itchy for, I think, years, but only intermittently. So I don't really think about it, and haven't looked for patterns as to what causes it.

There's no physical sign of it either, my palm looks normal. (Well now it's red because I'm scratching it with my nice long nails.)

Weird. There are more things in heaven and earth than dreamt of in dermatology, I tell ya.