Why does clove oil make the skin burn?

If it's just oil, and if just a little goes on it starts to burn, almost too badly of a burning sensation to bear and it must be wiped off, almost but not too much, wow . Why does it burn?Why does clove oil make the skin burn?
In the world of henna body art (Mehndi), many find bottles of clove (Syzygium aromaticum) oil suggested for use after you have removed the henna paste in order to make the design set and become darker. These oils are also in a blended form and simply called ';Mehndi Oil';. Unfortunately many have suffered severe burns after using the oil on their skin. This has caused many to suggest not using clove oil at all. Clove oil causing irritation and dermatitis is not new to those trained in Aromatherapy. Cloves contain a major irritant called ';eugenol';. The area of the plant that contains the least amount of this natural chemical is the buds. The buds of cloves also produce a good amount of oil but not surpassingly can only be harvested at a limited, certain time of the year. This causes some (greedy) growers and manufactures to substitute oil extracted from the stems and leaves of the clove plant. This creates a very toxic oil that can burn the skin.