GLOSSARY

Alopecia

Hair loss or baldness caused by hereditary disposition, illness, or any functional disorder is called alopecia in medical terms.

Alopecia Areata

An autoimmune disease in which loss of hair occurs in some or all areas of the body is called alopecia areata. Since it causes bald spots on the scalp, it is also known as spot baldness.

Alopecia Totalis

Loss of complete hair on the scalp is known as alopecia areata. It is an advanced form of alopecia areata.

Androgenetic Alopecia

Androgenetic alopecia is the most common form of hair loss in both men and women. In men, this condition is called as male-pattern baldness. Hair falls in a well-defined pattern from above both temples, eventually receding to form a characteristic “M” shape.

The pattern of hair loss in women is different from that of men. In women, hair becomes thinner all over the head. Hairline does not recede.

Alopecia Universalis

The complete loss of hair from the scalp and body is called alopecia universalis. It is an autoimmune condition in which a person’s own immune system attacks hair follicles. An itching and burning sensation are two common signs of alopecia universalis.

Anagen

The growing phase of the hair growth cycle is called anagen. The duration of this phase usually lasts between one and seven years.

Anagen Effluvium

Loss of hair that is in the growing or anagen phase of the hair growth cycle is called anagen effluvium. This is usually caused by chemotherapy or radiation treatment.

Androgen

It is a male hormone. Testosterone is the major androgen.

Catagen

The second phase of the hair growth cycle is called the catagen phase. It comes after the anagen phase.

Crown Area

The area on the top back of the head that has a swirl or spiral pattern of hair is called crown area. It is also known as the “Vertex”. Usually, the first sign of hair loss is seen here.

Cuticle

The outer layer of a hair is called cuticle. It is the hair’s protective shield.

Dermal Papilla

A structural formation at the base of hair follicles is called dermal papilla. It provides oxygen and nutrients to hair follicles ensuring their healthy growth.

Dermis

The second layer of the skin is called the dermis. It is the innermost layer.

Dihydrotestosterone (DHT)

It is a male hormone responsible for hair loss. DHT is created after male hormone testosterone comes in contact with the enzyme 5-alpha reductase.

Donor Site

The lower back of the head where the density of hair usually remains thick for a lifetime is called the donor area.

Donor Hair

Hair in the donor area are called donor hair. They are extracted and implanted to cover scalp area suffering from hair loss.  

Epidermis

The outer layer of the skin is called epidermis. It is nonvascular.

Female Pattern Baldness

A hereditary pattern of hair loss in women is known as female pattern baldness. Female pattern baldness is different from male pattern baldness. In this condition, women generally experience thinning of hair all over the head. Women do not experience receding hairline. 

Follicle

It is the root of hair below the surface of the scalp. It looks like a bulb and sack sometimes. It is a sheath in which hair grows.

Follicular Unit

A group of one or more hair follicles is called a follicular unit. A follicular unit generally has 2.4 hairs.

Frontal Alopecia

Frontal Alopecia is characterized by the loss of hair at the front of the head.

Grafting

A procedure in which skin containing hair follicles is removed from the donor area and implanted in the recipient area. Minigrafting (3-8 hairs) and micrografting (1-2 hairs) are two popular methods of grafting.

Grafts

Transplanted hair.

Hair Follicle

A strand of hair with its root is called a hair follicle. They are extracted from the donor area and implanted on the recipient area.

Hair Plugs

It is a slang term for the large round grafts. They are not used much nowadays.

Hair Transplant

A surgical procedure in which hair follicles are transferred from the lower back of the head to the recipient area by the surgeon.

Hair Weaving

A process in which a hair piece is attached to existing hair on the scalp.

Hamilton Scale

A method proposed by Hamilton to rate the extent of hair loss.

Keratin

It is a type of insoluble, tough, and fibrous protein which forms hair and skin.

Male Pattern Baldness

One of the most common forms of hair loss in men, male-pattern baldness affects more than 50% of men over the age of 50. Hairs fall in a well-defined pattern from above both temples, eventually receding to form a characteristic “M” shape.

Melanin

Pigmenting granules present in keratin fibre of the hair shaft. It determines the colour of the hair. It reduces with age resulting in gray or white hair.

Minigraft

A small hair graft which contains three to eight hair follicles.

Non-Scarring Alopecia

Loss of hair without any scarring is called non-scarring alopecia. It is also known as noncicatricial alopecia.

Norwood Scale

A scale to measure the extent of hair loss is called the Norwood scale.

Recipient Site

The area affected by hair loss or the area where donor hairs are transplanted is called the recipient area.

Scalp Reduction

A surgical treatment to remove scalp areas affected by alopecia. The main purpose is to reduce the overall bald area from the scalp.

Telogen

The resting phase of the hair growth cycle is called telogen. It lasts for 3 months.

Telogen Effluvium

This is the second most common form of hair loss after androgenic alopecia. This condition causes hairs enter into the telogen phase.

Telogen Loss

Loss of hair in the telogen phase is called telogen loss. It is also called the natural loss of hair.

Traction Alopecia

As the name suggests, this type of hair loss is caused by the traction applied to hair. It is commonly associated with braiding, ponytails, and other types of hairstyles that put pressure on hair.

Trichotillomania

Hair loss caused by constant pulling and twirling is called trichotillomania.

Vertex

The crown area of the scalp is also called a vertex.