I've had several nitrogen treatments to my hands over the past 5-6 years. Little knots of kerotinized exfoliations of some sort. Doc says they're nothing to worry about so I don't worry. Pretty much the result of sun exposure before much was known about skin cancers and sun exposures. For the past 10-15 years I wear a hat, sunscreen and a loose longsleeve cotton shirt when I work outside.

If you're younger than me and look forward to a golden tan every year, I may bury you.