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Acne vulgaris (commonly called acne) is a skin disease caused by changes in the pilosebaceous units (skin structures consisting of a hair follicle and its associated sebaceous gland). Severe acne is inflammatory, but acne can also manifest in noninflammatory forms.[1] Acne lesions are commonly referred to as pimples, spots, or zits. Acne is most common during adolescence, affecting more than 85% of teenagers, and frequently continues into adulthood. For most people, acne diminishes over time and tends to disappear—or at the very least decrease—after one reaches his or her early twenties. There is, however, no way to predict how long it will take to disappear entirely, and some individuals will continue to suffer well into their thirties, forties and beyond. The face and upper neck are the most commonly affected, but the chest, back and shoulders may have acne as well. The upper arms can also have acne, but lesions found there are often keratosis pilaris, not acne. Typical acne lesions are comedones, inflammatory papules, pustules and nodules. Some of the large nodules were previously called "cysts" and the term nodulocystic has been used to describe severe cases of inflammatory acne. Aside from scarring, its main effects are psychological, such as reduced self-esteem[5] and, according to at least one study, depression or suicide. Acne usually appears during adolescence, when people already tend to be most socially insecure. Early and aggressive treatment is therefore advocated by some to lessen the overall impact to individuals. wiki Acne vulgaris Follicle A hair follicle is part of the skin that grows hair by packing old cells together. Attached to the follicle is a sebaceous gland, a tiny sebum-producing gland found everywhere except on the palms, lips and soles of the feet. The thicker density of hair, the more sebaceous glands are found. Also attached to the follicle is a tiny bundle of muscle fiber called the arrector pili that is responsible for causing the follicle lissis to become more perpendicular to the surface of the skin, and causing the follicle to protrude slightly above the surrounding skin (piloerection). This process results in goose bumps (or goose flesh). Stem cells are located at the junction of the arrector and the follicle, and are principally responsible for the ongoing hair production during a process known as the Anagen stage. The average growth rate of healthy hair follicles on the scalp is .04 cm per day. Natural skin care Natural skin care is the care of the skin (the largest organ of the body) using naturally derived ingredients (such as herbs, roots, and flowers) combined with naturally occuring carrier agents (everything from natural soap to oils to pure water). Many people with senstive skin have turned to natural skin care solutions. Many people use natural skin care recipes to care for their skin at home. Many spas and skin care salons now focus on using more naturally derived skin care products. There is, however, no actual definition of "natural". All ingredients are chemicals by definition. "Derived" ingredients are "unnatural" both according to the original substance and the method of derivation. |
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