Hair Growth - PowerPoint PPT Presentation

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Hair Growth

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  1. Hair Growth Types of hair Growth cycles of hair Hair growth myths

  2. Types of hair • Vellus or lanugo • Short, fine, downy, unpigmented hair covering most of the body except the palms and soles of feet • women normally retain 55% more vellus hair than men • Terminal hair • Long, thick pigmented hair found on the scalp, legs, arms & bodies of males & females • Coarser than vellus hair &, with the exception of gray hair, it is pigmented

  3. Growth Cycles of Hair • Anagen • Growing phase • Average growth about 2” per month • 90% of hair is growing at one time • Grows for a period of from 2-6 years • Duration of hair life affected by gender, age, type of hair, heredity, nutrition, & health

  4. Growth Cycles of Hair • Scalp hairs grows faster on women than men. • Grows faster between 15-30 and slows sharply after age 50 • Catagen • Transition phase • Ends the growth phase and lasts only one to two weeks • Follicle canal shrinks & detaches from the dermal papilla • Hair bulb disappears and the shrunken root end forms a rounded bulb • Less than 1% of the scalp hair is in the catagen phase at any one time

  5. Growth Cycles of Hair • Telogen • Resting phase • After catagen, the follicle begins a three to six month phase of resting • About 10% of hair is in telogen phase at one time • After telogen, the cycle begins again • Entire growth cycle repeats itself every four to five years


  6. Hair Growth Myths • Clipping, shaving, trimming & cutting makes hair grow faster • FACT: have no effect on hair growth • Scalp massage increases hair growth • FACT: no evidence to indicate this is true. Minoxidil and Finasteride are the only treatments that have been proven to increase hair growth and are approved for that purpose by the FDAS

  7. Hair Growth Myths • Gray hair is coarser and more resistant than pigmented hair • FACT: other than lack of pigment, gray hair is exactly the same as pigmented hair. It is not resistant because it is gray, & is not more resistant than the pigmented hair on the same person’s head • Amount of natural curl is determined by racial background • FACT:anyone of any race can have straight or extremely curly hair

  8. Hair Growth Myths • Hair with round cross-section is straight; hair with oval cross-section is wavy; hair with flat cross-section is curly • FACT: cross-sections of straight hair tend to be round and curlier hair tends to be more oval, but cross-sections of hair can be almost any shape, including triangular; the shape of the cross-section does not always relate to the amount of curl or the shape of the follicle

  9. Summary • There are two types of hair, vellus and terminal • There are three cycles of hair growth, anagen, catagen & telogen Next lesson – hair loss