What causes the warming reaction in warming cosmetics?

What causes the warming reaction in ';warming'; products when they are introduced into water.





I see a high concentration of citric acid, which seems a bit much if just used as a preservative or mild exfoliant.





So which cosmetic ingrediants cause this reaction and why?What causes the warming reaction in warming cosmetics?
Sensitizer


Taraxcum officinale extract: It increases solubility of fragrance oils into water.


Marjoram oil: Increases blood flow used in lotions, hair products and makeup. When you have an increase in blood flow you begin to feel a warming sensation and sometimes gives you rosey cheeks or blotching to the skin.What causes the warming reaction in warming cosmetics?
chemical reaction between alkaloid's and acids
some chemicals dissolved in water produced heat or even react with others ( because they are now compound and reactive )that produces heat.