Post by niudehao on Sept 2, 2013 6:00:16 GMT -5
Hair is a simple structure, but it has important functions in social functioning. The hair bulb is the base of the hair follicle. In the hair bulb, living cells are divided and are grow to build the hair shaft. cheap lace front wigs The blood vessels that nourish the cells in the hair bulb, and deliver hormones that affect hair growth and structure at different times of life.
Hair growth occurs in cycles of three phases:
Anagen (growth phase): most of the hair that grows at a given time. Each hair spent several years at this stage.
Catagen (transition): in a few weeks, the hair growth slows and shrinks hair follicles.
Telogen (resting phase): more month for the growth of hair and old separates the hair from the follicle. A new hair begins to grow stage, pushing the hair of age.
Hair grows at different rates in different people, the average rate of about OneHalf inch per month. The hair color is created by the pigment melanin in the hair-producing cells follicle. With age, pigment cells die and the hair turns grey.
Alopecia areata: dots total loss of hair, beatywill usually on the scalp. The cause of alopecia is not known, and the hair grows back.
Male pattern baldness: the most common type of hair loss in men. Male pattern baldness usually include either a decline in hair, loss of hair at the Crown, or both.
Female pattern baldness: in women, hair loss usually includes uniform thinning throughout the scalp, with a preserved line. The Crown can be affected, but rarely of hair loss
the next item is the baldness as men. See the photo of the female pattern baldness.
Dandruff (seborrheic dermatitis): a slight permanent swelling of the scalp, which results in a scaly skin which can cause itching and flaking. Seborrheic dermatitis may also affect to thethe ears and face.
Tinea capitis (ringworm): synthetic lace front wigs a fungal infection on the scalp, creating round patches of hair loss. Despite spots may appear in the form of ring, no worm involved in tub
Capitis.
Trichotillomania: a mental disorder which includes the urge irresistible to the hair. Pull the hair results in significant hair loss patches, their cause is
unknown.
Lice: small insects that live on the scalp and feed on blood. Children and adults schoolaged preschool and primary life with children are more sensitive to catch head lice, which are spread by close contact.
Telogen effluvium: one or two months after a personal crisis (such as surgery, childbirth, serious stress), hair can get much at large plots. Usually, it begins the new hair
regrowth immediately.
Postpartum postpartum alopecia hair loss is a form of Telogen effluvium and usually disappears without treatment.
Folliculitis: inflammation of the hair follicles, usually due to infection. Staphylococcus aureus is a bacteria that often causes Folliculitis. Acne is a form of Folliculitis is caused by the inflammation. This inflammation can be sometimes aggravated by the bacterium Propionibacterium acnes.
Stone (nodular Trichomycosis): infection by fungi in the hair shaft. Hard nodules fungi cling to the fibers of the hair, sometimes causing hair loss.
Hirsutism: A condition in which women develop hair malepattern (like facial hair). An excess of testosterone because of a medical condition is usually responsible.