It is not easily explained to the normal mind of Man for it involves strange flows of energy in the body and should you try to share the information of these flows, you will find that they will build a wall with question and denial that you will have to argue and debate. The body has need to restore balance and strength and perfect function of the immune system to eliminate the response of allergens. When the allergens attack and the immune system is toxified and out of balance, through stress, or foods, or chemicals, and when it's not working in perfect balance, it is sending out signals to attack that inert substance which then produces histamines which attack the body.
People can understand something like that.
But for you to explain what you're doing, the magic of the fingers. Much like telling them you are a magician. And you're going to magically make them alright. They will sometimes accept that, but oftimes be convinced it doesn't work, putting more stress on their immune system and it will return to acting irresponsibly. Your body is subjected to substance that it normally is inured to.