hair

• hair

  is formed from keratin produced by matrix cells in the dermal layer of the skin. Each hair lies in a hair follicle.
• People have two types of hair

  vellus and terminal hair
• vellus hair


  covers all over the body
• terminal hair


  darker and thicker hair that grows on the scalp and eyebrows
• ABNORMAL CONDITIONS OF HAIR

  cradle cap, scalp ringworm, toxic alopecia, alopecia areata, traumatic alopecia, trichotillomania, head lice, folliculitis, hirsutism
• cradle cap

  Is an inflammatory condition that usually occurs in areas of the body that have many oil-producing glands, Including the scalp, face, upper chest, and back, Dandruff is a mild form of seborrheic dermatitis
• scalp ringworm


  Is a type of fungal infection. The most common species of fungi affecting humans are Microsporum canis and Tricophyton verrucosum.
• toxic alopecia 


  Anagen effluvium occurs when hair growth is disrupted during the anagen phase.
• alopecia areata


  Is a condition that causes a person's hair to fall out. It is an autoimmune disease.
• traumatic alopecia


  That caused by self trauma (licking. scratching,chewing or pulling).
• trichotillomania 


  compulsive twisting or pulling of hair
• head lice


  It is caused by infestation with the human head louse, and it is usually very itchy
• folliculitis 


  a common skin condition in which hair follicles become inflamed. It's usually caused by a bacterial or fungal infection
• hirsutism male-pattern hair growth in women.