Which action is NOT appropriate in the treatment of a jellyfish sting?

When treating a jellyfish sting, several actions are recommended based on the biology of the jellyfish and the nature of the sting, while others are discouraged. The application of an ice pack is not appropriate in this scenario, as cold can cause the nematocysts, or stinging cells, to fire and release more venom, worsening the patient's condition. Instead, it's typically suggested to immerse the affected area in hot water, which can help alleviate pain and neutralize toxins from the sting.

Other methods like irrigating the area with vinegar, which helps to deactivate the nematocysts of certain types of jellyfish, and scraping away any tentacles that may be on the skin using a rigid object are effective in preventing further envenomation. These actions promote proper care of the sting site, whereas applying ice may inadvertently enhance the symptoms of the sting.