What do non - stinger bees do to humans when the bees lay on humans's skin?

Most of the time all bee's unless you threaten them or their hivesMosill ignore and just be go on their merry way. A stingless bee including the males of all bee species and those without stingers at all will bite however if you threaten them. Some excrete acid or toxins if you mess with the wrong kind. Overall stingless bees tend to be more friendly.