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Hair is a protein filament that grows from follicles found in the dermis.Hair is one of the defining characteristics of mammals.The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair.
Hypertrichosis is an abnormal amount of hair growth over the body. [1] [2] The two distinct types of hypertrichosis are generalized hypertrichosis, which occurs over the entire body, and localized hypertrichosis, which is restricted to a certain area. [1]
However, it can appear thicker and more coarse than before due to the hair having a blunt tip after shaving. [26] While inexpensive, shaving can cause irritation, folliculitis , and ingrown hairs. [ 5 ] [ 27 ] Chemical depilatories use sulfides, thioglycolates, or enzymatic depilatory agents which dissolve hairs by breaking the disulfide bonds ...
Like many mammals, grizzly bears are covered in thick fur. Fur is a thick growth of hair that covers the skin of almost all mammals. It consists of a combination of oily guard hair on top and thick underfur beneath. The guard hair keeps moisture from reaching the skin; the underfur acts as an insulating blanket that keeps the animal warm. [1]
Scalp hair was reported to grow between 0.6 cm and 3.36 cm per month. The growth rate of scalp hair somewhat depends on age (hair tends to grow more slowly with age), sex, and ethnicity. [3] Thicker hair (>60 μm) grows generally faster (11.4 mm per month) than thinner (20–30 μm) hair (7.6 mm per month). [4]
The individual occurrence and characteristics of chest hair depend on the genetic disposition, the hormonal status and the age of the person. The genes primarily determine the amount, patterns and thickness of chest hair. Some men are very hairy, while others have no chest hair at all. All ranges and patterns of hair growth are normal.
In humans, terminal hair is a variant of hair that is thick and long such as that growing on the scalp, as compared with vellus hair, colloquially known as peach fuzz, growing elsewhere. [1] [2] During puberty, the increase in androgenic hormone levels causes vellus hair to be replaced with terminal hair in certain parts of the human body. [3]
Excessive hair growth within or on the ear is known medically as auricular hypertrichosis. [5] Some men, particularly in the male population of India, have coarse hair growth along the lower portion of the helix, a condition referred to as "having hairy pinnae " ( hypertrichosis lanuginosa acquisita ).