Tips : impact of sweat on altimeter

Hello, 

One question, after 1hour and half, the altimeter signal shows lot of spikes leading to a positive assend D+ that is not realist... I am sure that is due to sweat, I have still this issue on fenix 3 and 5 but earlier because hole for altimeter are biger and closer to the skin... This spikes appears after a small stop when my skin start to sweat and it's correlated to an increase of watch température sensor arround 23 degrees.

Did you ever met this ? Have you found some tips to avoid it ? 

Thanks