PABA: Para-aminobenzoic acid. Found in the vitamin B complex. Used as an ingredient in some sunscreen products. Palette: A grouping of colors by family of tones or specific function. Panthenol: Also known as vitamin B5, acts as a penetrating moisturizer. Paraffin: A beeswax substitute derived from petroleum. Petrolatum: Used in creams, it softens and soothes skin. Forms a film to prevent moisture loss. pH: Percentage of hydrogen. Used to measure acidity in cosmetic preparations Photoaging: Skin damage incurred through sun exposure. Photosensitivity: A condition in which the application or ingestion of certain chemicals or foods can cause skin problems, such as rash, hyperpigmentation and swelling, when the skin is exposed to sunlight. Phytocosmetic: Cosmetics which are made from plants. Pore: Small opening of the sweat glands of the skin. Psoriasis: A chronic disease of the skin consisting of itchy, dry, red patches, usually affecting the scalp or arms and legs. It may be treated with OTC or prescription medications.