What is the difference between the 3 PCA Peel Formulas?

For those who have sensitive skin, ethnic skin, are allergic to hydroquinone or not looking to lighten the skin would benefit from PCA Peel HQ Free. For those looking to lightening the skin or even out their skin tone would benefit from PCA Peel w/HQ. For those looking for more aggressive treatment and who have “plateaued” with monthly treatments thus far would benefit from the PCA w/HQ & Resorcinol.