How is hair depth measured?

Measuring hair depth involves determining the distance from the surface of the epidermis to the bottom of the hair bulb. This measurement is significant because it provides insight into the anchorage and growth cycle of the hair follicle within the skin. The hair bulb, where the hair originates, sits beneath the epidermal layer, and understanding the depth can aid in effective hair removal techniques.

Measuring from the surface of the dermis to the hair surface or from the root to the tip of the hair does not provide an accurate representation of the depth of the hair follicle itself, as those measurements do not focus on the relationship between the skin layers and the hair bulb. Additionally, measuring from the hair surface to the bottom of the hair bulb fails to consider the necessary distance starting at the epidermis, which is integral to understanding the complete depth of the hair growth environment.