Hot water only works on superficial wounds any deeper wounds the venom enters the blood stream & hot water will not do anything for it!!!!!!!!!! It is extremely painful but not deadly unless allergic to them? Most people will have to wait it out with hours of horrible pain, swelling & possibly some temporary paralysis. The affected area could have some pain or discomfort for a week or more afterwards. The only chance for immediate pain relief is at your local hospital with a nerve blocker like they would give you before getting stitches chances are once you get stung real bad by one you will never even look at another lionfish!!!!! Best of luck & be carefull