Are Dark Spots On The Palm A Sign Of HIV?
In my experience I have never seen a person labelled to be HIV with the pictures shown by you. So you should not worry about it.
I checked them and found could be dermatitis since they are itchy.
Sweaty palms can lead to a simple, non serious and self limiting condition called Dyshidrotic eczema, this fits your description.
I suggest to apply ALDRY powder to your palms every 4 hours while working.
This helps. Do not scratch the dark patches.
Yes your occupation can cause this skin issues presented here. That's valid point. You should wear protective gloves to avoid contact with them.
You can apply a thin layer of oil while at work which can protect from harmful effects on skin.