Question

Why our skin irritates when we touch a jellyfish?

Answer 1

Jellyfish belongs to the phylum Cnidaria. Like all cnidarians, jellyfish have special cells along their tentacles called cnidocytes. Within these cells are harpoon-like structures full of venom, called nematocysts. The nematocysts shoot out when triggered by touch and can penetrate human skin in less time than it takes you to blink.
Once the venom is injected it causes pain, blistering and redness.