How many hairs are on a human head?

by Siddhi Camila Lama, Ph.D. | Jun 12, 2025 | Hair Science

Babies are usually born without hair. Yet, as we age, more hair grows on our scalps — but only up until a certain point. Age-related hair loss, which affects both young and middle-aged adults, can be caused by a variety of different factors, including lifestyle,...

The Norwood scale (What it is and how it’s used)

by Siddhi Camila Lama, Ph.D. | Nov 24, 2024 | Hair Science

The Norwood scale, also commonly referred to as the Norwood-Hamilton scale, is a classification system for pattern hair loss (also known as androgenic alopecia). This type of hair loss is a progressive genetic and hormonal condition that results in eventual baldness...

What are the parts of the head?

by Siddhi Camila Lama, Ph.D. | Nov 13, 2024 | Hair Science

If you’ve recently been diagnosed with androgenic alopecia, you’ve probably started to hear a lot of weird words thrown around – like ‘vertex’, ‘occiput’, or ‘forelock’. Whether you’ve read them on a minoxidil...

What’s the difference between vellus hair and terminal hair?

by Siddhi Camila Lama, Ph.D. | Jul 26, 2024 | Hair Science

Humans have hairs – and hair follicles – all over their bodies. The long, clearly visible, darker hairs are known as terminal hairs. The short, thin, pale hairs that exist across bodies and faces are known as vellus hairs. You’ve probably heard of...