Dark circular fry patch on the back of my hand

Skin, nail and hair health
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[](https://)Dy patch suddenly appeared on the back if my hand thats not itchy. can someone help me with what this might be? I went to a GP and he said that it might be a callus but i did not do any heavy lifting work that was in contact with this area [](https://)
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Did this appear over days or weeks? Is it becoming itchy? What sort of work do you do? Is it getting larger or just the same size? You seem to have a smaller patch on the base of your thumb…did that appear at the same time?