Hi Jalal,

The first thing that comes to mind for me is passive heat exposure. If you had access to a climate chamber or sauna, an individual could sit in there and they will sweat. However it would induce a non-localized sweat (i.e whole body would sweat). If you wanted to get the hand specifically perhaps you could use some kind of insulated wrap over the area in question, combine that with moderate heat exposure the area should sweat without the rest of them sweating too much. Though perhaps someone else has a better idea in regards to getting just one area to sweat.

Hope that helps a bit,

Cheers,

Oliver

Thanks Oliver for your kind suggestions.