What to do if you've been stung by a jellyfish? - Don't rub the affected area with sand or with a towel - Proceed very carefully to remove any fragment of tentacle you might still have stuck in your skin - Neutralize the poison by constantly applying alcohol or vinegar for 30 minutes - Clean the affected area using seawater. Never use fresh water - Apply some ice between 15 to 30 minutes - Apply a thin coat of hydrocortisone three times a day. Don't rub the medication cream on the affected area - Go see a doctor if the symptoms do not subside

What to do if I stepped on a sea urchin? - Clean the affected area with seawater and remove the sting immediately - Clean the affected area with abundant alcohol - Apply a thin coat of hydrocortisone three times a day. Don't rub the medication cream on the affected area - Go see a doctor if the symptoms do not subside

What to do if I've been bitten by or I've stepped on one of those fish that remain buried in the bottom of shallow seas? - Remove the sting these fish usually have on their dorsal fins and clean the wound with seawater or physiological serum - Dip the affected area in lukewarm water and start adding as much hot water as you can resist. This is done to neutralize the poison - Apply ice on the affected area to bring the swelling down once the pain is gone - Go see a doctor if the symptoms do not subside