Normally in a healthy person approximately 85% of scalp hairs are in active growing stage known as anagen hair or thick hair and only 15% are in resting stage known as telogen hair. Usually it is normal to lose about 50 to 100 hairs in a day while combing or washing the scalp hair. In case of any precipitating factor or some stress such as any illness and/or some viral fevers like dengue or Malaria which is common in our country, pregnancy, nutritional deficiencies, some medications weight loss and many other such conditions the ration of anagen to telogen hair is reversed and there is noticeable hair fall which requires attention and consultation with dermatologist.
It is also known as male pattern hair loss which affects almost all men and greatly depends on genetic on the person. In female there is a similar kind of hair loss and thinning of hair in mid frontal area of scalp which is called as female pattern hair loss.
It is a patchy hair loss that can affect any hair bearing area but it is more common in scalp or beard region, It is noticed mostly by hairdresser accidently. Loss of hair can manifest as a single patch or multiple patches. Alopecia aerate if not treated can lead to permanent hair loss of scalp known as alopecia totalis or alopecia universalis resulting in complete loss of body hair.
Fungal Infection of scalp hair aka Tinea capitis
It is a fungal infection of scalp hair more common in children but also seen in adults. The source of infection is either from soil or animals.
Tinea capitis has many clinical manifestations
1. Scaling – dandruff like
2. Black dots in which hair are broken off at the scalp surface with scaly smooth areas of hair loss
3. Kerion in which abscess and boils are formed with pus drainage
4. Favus presents with yellow crusta and matted hair