Catagen is a transient period. Hair matrix cells stop dividing. As a result, there is no hair growth. Since on average, each person has about 100,000 hairs. Therefore, less than 10,000 should be in telogen phase and on each day less than 100 hairs fall off physiologically.
Marginal alopecia affects the hair margin only.
It occurs in alopecia areata or due to hair styling. Frontal and bitemporal alopecia is typical of male-type baldness. The diagnosis can be made from a detailed history of the past health. In case when the diagnosis is in doubt, it can be confirmed by the telogen hair count test. It is done by plucking a bundle of hairs and counting for the percentage of telogen hairs present.