The Process of Hair Growth
When it comes to human hair growth, it is important to note that it can occur almost anywhere on the body, with the exception of mucous membranes and certain glabrous areas like the palms of the hands, soles of the feet, and lips. The hair growth cycle consists of three distinct phases known as anagen, catagen, and telogen.
Each individual strand of hair goes through these phases independently, which means that they can be in different stages at any given time. The first phase, known as the anagen phase, is the active growth phase. For head hair, this phase typically lasts for about three to four years. However, for areas such as the eyelashes, eyebrows, and hair on the extremities, this phase is shorter, lasting between one and several months.
Following the anagen phase is the catagen phase, which lasts for a few weeks. During this stage, the growth rate of the hair slows down. Additionally, the outer root sheath of the hair shrinks and attaches itself to the hair root.
Finally, we have the telogen phase, which is considered the resting phase of hair growth. During this phase, the hair follicle remains dormant before eventually shedding the existing hair strand and entering the anagen phase once again to begin the process anew.
Understanding Different Types of Hair
Each part of our body is covered in hair, but the type of hair can vary depending on its location. Our arms have different hair than our scalp, and even the hair in the pubic region is distinct. It’s important to know that hair also goes through various changes during its growth stages.
When a baby is born, they might be covered in a delicate, soft hair known as lanugo. This fine hair is the first type of hair that develops in the fetal hair follicles. Usually, the baby sheds this hair before birth, typically during the seventh or eighth month of pregnancy. However, in some rare cases, the lanugo hair may persist for several weeks after the baby’s birth.