The jellyfish stings ah I was also swimming in the Dandong Sea the day before yesterday, was stung 2 times a in the hand a in the stomach scared me rushed to the shore to ask the lifeguard phenomenon is red, swollen, stinging pain, but also hot and spicy lifeguard said it is the jellyfish stings asked me to use a little white vinegar ~ not poisonous. Since we were out for fun, we went back and put on some Mentholatum to soothe it, and the swelling went down later that day, and it stopped hurting for 2 days, but there are some small marks. If you are not sure, you can go to the drugstore to let the people there to give you a look, they usually know at a glance.