Hair is a complicated structure. It transmits sensory information and creates gender identity. Those affected by any hair problems find that it can cause social or self-esteem problems, indicating treatment for both psychological and physiological reason. The hair growth cycle consists of three distinct stages – Anagen phase: Growing phase (~ 3 years); keratin is produced in the hair bulb, Catagen phase: Regression phase (~ 3 weeks); hair bulb separates from the dermal papilla, and Telogen phase: Resting phase (~ 3 months); old hair is shed
Hair comprises of :
- The Hair Follicle
- The Shaft
Dandruff is a condition of the scalp in which scalp sheds larger than normal amounts of dead epidermal cells. Dandruff is characterized by itching and visible dry flakes or oily ﬂakes which may appear greasy and yellow in color(in the presence of seborrhea).It is not a disease but rather a normal physiological event makes scalp look unhygienic and untidy and unaccepted socially.
WHAT CAUSES DANDRUFF?
- Fungus(Malassezia) is considered as one of the main cause of dandruff. It converts sebum triglycerides into irritating free fatty acids and is involved in scalp hyperproliferation. Under increased sebum activity Malassezia proliferates resulting in the scalp itching and flaking.
- Seborrheic dermatitis is a more severe disorder which include desquamation of facial areas other than the scalp and visible inﬂammation
NEED TO CONTROL
- Microbial activiton
- Seborrheic activity
Hair growth is linked to hair growth cycle. The hair growth cycle consists of three distinct phases: the first phase is Anagen phase- growing phase(~3 years); keratin is produced in the hair bulb. Next is the Catagen phase: Regression phase(~3 weeks); hair bulb separates from dermal papilla and third is the Telogen phase: Resting phase(~3 months); old hair is shed.
What causes hair loss?
Due to changes in hair growth phases such as changes in proportions of growing and resting phase hair, decrease in the duration of growing phase leading to shorter and thinner hair, and prolongation of interval separating the loss of hair in resting phase and emergence of replacement growing phase hair leads to hair loss.
Other causes include effect of Androgens on genetically predisposed hair follicles, where 5-alpha reductase converts testosterone to dihydrotestosterone(DHT) which in turn leads to hair loss(Androgenetic Alopecia). Excessive sebum affects the growth of hair follicles by blocking the pores.
Lack of certain nutrients such as Zinc, Vitamins, Essential Fatty Acids, Amino Acids and Proteins affects the functioning of hair follicles and leads to shedding, hair strand breakage.
NEED TO CONTROL
- Shortening of hair growth cycle
- Level of dihydrotestosterone
- Deficiency of hair nutrients( Vitamins, amino acids etc)