Usually, the bites of a mosquito, wasp or black fly are sore and itchy. Apply an antiseptic to clean the skin, then an anesthetic to take down the pain created by the bite. Avoid scratching, because it will only make it worse and increase the inflammation. In case of complications, like unendurable pain or swelling, call for medical assistance.
In the case of a bee sting, act as fast as you can, because the bee will leave its venom sac inside the skin to secrete more venom into the bloodstream. Take the stinger off with a tweezers and then, clean the bite with alcohol wipes. Apply calamine lotion to reduce itchiness and ice cubes for pain relief.
People, who are allergic to bee stings, should always carry an adrenaline syringe. The syringe is self-administered and pre-loaded, called an EpiPen. A patient should be able to use the syringe on his own.
In extreme cases, where adrenaline injection has to applied, contact medical attention right away, even if the adrenaline seems to work. Further complications might arise, such as difficulty breathing, extra swelling and redness of the skin and sometimes, fever.
Immediate medical involvement increases the chances for rapid recovery.