Phenol peels are the deepest type of chemical peel and they address imperfections such as acne scars, blotchy skin and coarse wrinkles. This peel uses carbolic acid to treat the skin. The patient is put under sedation and anesthesia is used to ease any discomfort. The chemical solution is applied to the skin and the patient may feel a mild burning or tingling sensation. The phenol solution is left on the skin for a certain amount of time and it is then washed off with water. A soothing ointment is applied to the area.