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Hydroquinone is a topical depigmentating agent used in hyperpigmentation conditions by suppressing melanocyte metabolic processes. It also increases melanin excretion from melanocytes and prevents its production.
Octyldimethyl P-aminobenzoate is used topically as a sunscreen. It is used to prevent sunburn, but unlikely to prevent drug-related or other photosensitivity reactions associated with UVA light.
Dioxybenzone (benzophenone-8) is an organic compound used in sunscreen to block UVB and short-wave UVA (ultraviolet) rays. It is a derivative of benzophenone. It is a yellow powder with a melting point of 68 °C. It is insoluble in water, but moderately soluble in ethanol and isopropanol.
Oxybenzone: Although benzophenones are primarily UV-B absorbers, oxybenzone absorbs well through UV-A II. Oxybenzone can be considered a broad-spectrum absorber. It significantly augments UV-B protection when used in a given formula.