What is the pimple on toad? What's in it?

Toad's pimple is a poisonous gland, which is used to protect itself. When the enemy attacks it, the poison gland will secrete a yellow and odorous toxin to warn the enemy that it is poisonous! You eat me, you are finished! Toads usually molt once every two months, and molting can be used as medicine! Someone specializes in raising toads, and artificially catalyzes 1 molting twice a month to grow a complete toad skin, which is about 5 yuan or 15 yuan, I forgot.