Do jellyfish sting hair

Jellyfish cannot sting hair because hair cannot be penetrated by the jellyfish's tiny stinging 'barbs.'

However, the barbs can easily pierce skin and inject the jellyfish venom/poison into the skin and this makes the 'sting.'

So it is not a good idea to put a jellyfish on your head, because it just might be able to sting your scalp! Now that WOULD be painful!