Hair Follicles – What Makes Hair Grow? - The Hair Skin & Wellness Clinic

Hair Follicle and Calibre

There are three types of hair follicles:

  • Terminal hairs: Terminal hairs are considered healthy hair, and are present on a normal healthy head of hair. These hair strands usually fall in the hair calibre range of 60 – 84 micrometres.
  • Miniaturized hairsMiniaturized hairs are hairs from terminal hair follicles that have been affected by DHT, causing thinner hair shafts. The miniaturized hairs are usually between 30 – 60 micrometers in diameter.
  • Vellus hairs: Vellus hairs are fine, short and barely noticeable, and can be found all over the body. The diameter of Vellus hairs are around 30 micrometers.

hair transplant involves the transplantation of hair follicles from a donor area on the patient’s scalp, to the area where hair loss has occurred (recipient area). Thus, there needs to be a sufficient supply of healthy Terminal hairs to be transplanted to help create the appearance of a fuller head of hair.


Hair Mass Index

Hair Mass Index (HMI) refers to the density and number of hair follicles per specified parameter, and is used to determine the extent of an individual’s hair loss. This method also assists to determine the type of Alopecia, and can indicate the progress of hair loss treatments undergone by the individual.

Hair Follicle - Structure

Now that you know about the different types of hair follicles the scalp can produce, lets take a look at the structure of the hair follicle itself and the properties associated with growing and maintaining it. Click the below to learn more:

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