Stridex
Encyclopedia
Stridex is an acne
Acne vulgaris
Acne vulgaris is a common human skin disease, characterized by areas of skin with seborrhea , comedones , papules , pustules , Nodules and possibly scarring...

 treatment and prevention medicine. It comes in the form of pads contained in a plastic tub of fifty-five to seventy-five pads. Most products in the Stridex line contain as the active ingredient salicylic acid
Salicylic acid
Salicylic acid is a monohydroxybenzoic acid, a type of phenolic acid and a beta hydroxy acid. This colorless crystalline organic acid is widely used in organic synthesis and functions as a plant hormone. It is derived from the metabolism of salicin...

 (0.5–2.5%); Stridex "Power Pads", however, contain instead benzoyl peroxide
Benzoyl peroxide
Benzoyl peroxide is an organic compound in the peroxide family. It consists of two benzoyl groups bridged by a peroxide link. Its structural formula is [C6H5C]2O2. It is one of the most important organic peroxides in terms of applications and the scale of its production...

(2.5%), and were the first acne treatment pads to do so without requiring a prescription for purchase.
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