From Regular Shaving to Long-Term Hair Reduction: A 10-Session Underarm Case on the Zemits Quidion Lite Pro

The client came in requesting laser hair removal due to the frequent need to shave the underarm area.
Tetiana Vasyliuk built a 10-session course with parameters individually selected for Fitzpatrick Skin Type II.

10 sessions — and the hair in the underarm area is barely noticeable, while shaving is no longer part of the client's regular routine.

these parameters describe a specific clinical case and are not a universal preset. Treatment settings are selected individually by a licensed professional according to the client's skin, hair characteristics, and response.

Client Profile & Course Parameters

How This Physics Is Implemented in the Zemits Quidion Lite Pro

808 nm Diode Laser: Light Works
Through Melanin

Shaving: The Hair Is Cut at the Surface

Hair within a single treatment area is at different phases of the growth cycle at the same time.
The most favorable phase for laser hair reduction is the anagen phase, when the hair is actively growing and has a functional connection to the follicular structures.
That's why professional laser hair reduction is built as a series of sessions with intervals: each subsequent treatment works with the portion of hair that is in the appropriate growth phase at that time.
In this case, the course consisted of 10 sessions at 4–10 week intervals.

The 808 nm wavelength defines the optical interaction with melanin, but professional treatment also depends on how the energy is delivered.
The Quidion Lite Pro gives the licensed professional control over the key treatment parameters:
Energy Determines the amount of laser energy delivered to the treatment area.
Pulse Duration Determines how long that energy is transferred.
Frequency Determines the rate at which consecutive laser pulses are delivered.
Cooling Helps control the temperature conditions during laser delivery.
This case used 3 Hz, a medium pulse duration, and above-average power — parameters the specialist selected specifically for this client.

In laser hair reduction, the key chromophore is melanin.
The Quidion Lite Pro delivers controlled 808 nm diode laser energy. The light energy is absorbed by the melanin in pigmented hair structures and converted into heat.
This principle is known as selective photothermolysis:
808 nm light → absorption by melanin → conversion to heat → thermal effect in follicular structures → gradual reduction in hair regrowth
In other words, the diode laser no longer works only with the part of the hair we see above the skin's surface. The thermal effect reaches the associated follicular structures involved in hair formation and regrowth.

A razor cuts the hair shaft — the part of the hair located above the skin's surface. The follicular structures beneath the skin remain functional, so hair growth continues.
That's why shaving has to be repeated.
At the same time, shaving does not make hair thicker or darker, and does not speed up its growth. After cutting, the hair simply has a blunter edge, so as it grows back it can feel coarser to the touch.