What might have been my uncle's skin condition?

My uncle had hardened scarry/scabby type tissue on the backs of his hands that would crack. He worked outside most of his life, so I presumed that it was cumulative results of sun damage, but maybe not. He never went to the doctor about it, and just lived with it, whatever it was.

Any informed or uninformed opinions welcome.

And if there’s any concern about medical advice, he died in 1976.

Was it just on the backs of his hands? It could have been psoriasis, but it probably wouldn’t just be there. It could have been a lot of precancers, or actinic keratoses, if he had a lot of sun exposure and no medical treatment for them. Or it could have been some sort of hyperkeratotic condition, where the skin overgrows and becomes hard and scabby.

Well, I think he also had some scarry places on back of his forearms, too.

Here are precancers- they are roundish, pink, scaly, and flaky.

This is what benign seborrheic keratoses look like.

This is psoriasis.

The hyperkeratotic skin can be disturbing, so I won’t link- just googleimage those words and you’ll see.

Google ‘Tree man’ (squick warning) Warts gone amok.

Sounds like psoriasis, eczema, or maybe a type of ichthyosis (I have a very mild form of ich. vulgaris, my dad’s is more troublesome - he always had thick scaly skin prone to cracking and bleeding on his hands and feet, as well as scaling and flaking elsewhere). Google at your own risk!