All chemical peels - whether mild, medium or deep - work by brushing on thin layers of an acidic formula to the skin, where the target skin condition is. Sometimes, it is only one layer. The acid dissolves old skin on the top layers of the dermis. The application of the acid intentionally causes these superficial layers of the skin to peel off. Then, the body kicks in its natural response to produce healing collagen. New skin cells are formed. This forms a young, fresh dermal layer. It’s a skin rejuvenation method that has been used for about 100 years, or more, by some accounts. Chemical peels look and feel like a sunburn. And, of course, some sunburns can be worse than others. It is the same with the formulas used in a chemical peel, to get skin to fall off. Some are stronger than others.