How long does a alopesi hair grow in one month?
Each follicle produces a number of hairs during a lifetime. There are 3 phases:
- Anagen or growth phase on the scalp lasts between 3 and 5 years and the hair grows at approximately 1cm a month. The duration of the anagen phase varies from person to person and it determines how long hair will grow if not cut. Usually about 85% is in anagen phase.
- Catagen phase follows the anagen and is an involutional stage that lasts around 2 weeks.
- Telogen or dormant phase lasts about 3 months. The hair remains in the follicle but does not grow.
At the end of the telogen phase the follicle starts production of new anagen hair which displaces the old one from the follicle and the old one is shed. In some animals this is synchronized to produce moults but in humans is unsynchronized and around 50 to 100 hairs drop out each day, mostly unnoticed. Sometimes people go through a phase of more predominantly telogen phase and they lose much hair in brushes and combs causing much anxiety but baldness does not develop.
In all forms of acquired baldness, skin that has previously been protected may be subjected to strong sunlight. Hats should be worn to prevent burning and possibly later malignant change.