Mentolatum... What is it?

Mentholatum... the chemical, not the brand, is a product that used to be in Vics. I believe it still is. This substance is actually the product of two chemicals menthol and petrolatum. I have a pretty bad reaction to these two products when their together. I can use Petroleum products and I can use products with Menthol, but when these two combine it just overloads my skin. Not in an acne way, I get acne-like bumps and I get headaches. I have no idea why this happens, but it does.