Generally, insect bites & stings happen by hymenoptera including mosquitoes, poisonous spiders, and oceanic life. Apoideas, vespoideas, and ants belong to hymenoptera.

Among hymenoptera, honeybees and humblebees among apoideas and yellow jackets, hornets, and wasps among vespoideas belong to poisonous bees, and fire ants among ants also belong to hymenoptera. When any of the insects mentioned above bites or stings you, bitten part of the body swells up, and it aches. Apoideas and vespoideas sting differently. Apoideas leave their stings in flesh, while vespoideas just sting and do not leave their stings in flesh. If any bee bites you, the bitten part of the body mostly swells, itches, and aches, and sometimes bee stings can cause a headache, dizziness, vomiting, difficulty in breathing, and even a shock if it’s really serious.

Scorpion fish and jellyfish are representative oceanic life that can damage human skin. Especially, box jellyfish and lionfish are representative. Box jellyfish is very dangerous, and if a person is bitten by it, he or she will die within 1 or 2 hours, or they may die within only a few minutes. Besides, coral and sea anemone are other oceanic life that sting. Sting poison is in a cell of the sting. The cell of the sting gets stuck in your skin, and then it bursts. Then, the poison gets in the body. If you step on an echinoid or thorny fish which is oceanic life that has thorns, the thorn gets stuck in your skin. Usually, the part where the thorn gets stuck hurts, but rarely are there serious symptoms. Poison of some ocean life in another country causes serious anaphylactic shock or paralyzes chest muscle to kill the person who is stung.

[First-aid Treatment When Bitten by an Insect]
When insects bite or sting you, the first-aid treatment using hot water immersion technique is the best known. First of all, you should remove the sting to inactivate the thermolabile of the insect’s venom on the bitten part of the body, and then put the bitten part in water which is 45℃. Then, the pain will disappear after minimum 30 minutes to maximum 60 to 90 minutes.
Oriental Medicine / A Folk Remedy
Hot water immersion technique has been used since about 1000 years ago.
[EX] Fishermen used the light of a cigarette when they were bitten by insects.
Western Medicine
Thermolabile venom ? If you apply heat of 45℃ or more to thermolabile venom, itchiness or pain is cured as the chemical characteristics change.

[Relevant Information]
Hymenopterous Insect Stings
http://maarec.cas.psu.edu/bkCD/HBBiology/insect_sting.htm#top
Scorpion fish
http://www.healthscout.com/ency/article/002849trt.htm

[ThermoThera Development Background]
1. It is hard to get hot water quickly outdoors or in everyday life.
2. It takes a long time to heat water, and it is difficult to adjust the water to a certain temperature.
3. When you use hot water, it is hard to treat the exact part of your body that an insect bites.
4. There’s a danger of skin burn when using hot water.
[Consultation] Lee Young mi, a section chief, an anesthetist at Dong Suwon Hospital