What are some of the different chemicals used in peel treatments?

Glycolic Acid: Glycolic acid is probably the most commonly used. It belongs to Alpha Hydroxy Acids. It works well on most skin types to accelerate the turnover of skin cells, restore elasticity and can help to improve the texture of your skin. Its smaller molecular size can make it too irritating for some skin types.
Salicylic: Salicylic peel is ideal for use on oily or acne prone skin types. Not suitable for clients with an allergy to aspirin.
Latic Acid: Lactic Acid is best, if you have dry skin, and age related issues like fine lines and wrinkles. It is also great for pigmented skin (sun or age spots). Like glycolic peel it belongs to AHA family, but generally causes less peeling and is good for those want less downtime, especially before any occasion.
Mandelic & Azelaic Acid: Mandelic & Azelaic are used for all skin types. Though both are mild peel having great results, they work well for fine lines, acne, rosacea, and pigmentation (especially post-inflammatory). They have strong antibacterial and antiseptic properties.
TCA (Trichloroacetic acid): TCA is recommended for hyperpigmentation, sun damage, acne, and fine lines.
Jessners: It is a combination of salicylic acid, lactic acid, and resorcinol, though there are now modifications for alternate Jessners-types of peels. This chemical peel is best used for treatment of acne, oily, or thicker skin.
Obagi Blue Peel
The Obagi Blue Peel is a very effective peel to maintain healthy skin. It is considered a medium depth peel. As it penetrates to the skin, it dramatically reduces wrinkles and causes skin tightening. This peel removes layers of aged and damaged skin, and promotes the creation of healthy skin. This peel smooth’s the surface of your skin, improves skin tone and color, help to reduce wrinkles, and shrinks pore size.
Phenol Peel
It belongs to very deep chemical peels, one of the strongest available. It help to Reduces wrinkles, to removes freckles, to improves appearance of superficial acne scars, to reduce hyperpigmentation and skin discolorations. Phenol peel must be done by a professional. Skin pallor is a potential side effect, so you will see a line of demarcation where the peel is applied. Phenol peel is best for those with fair skin and NOT suitable for darker skin types
Cosmelan : it is a combination deep peel done for skin pigmentation. It needs to be done just once in 9-12 months.