What it is
Laser hair removal uses a pulse of light tuned to be absorbed by melanin — the pigment that gives hair its color. The melanin in the hair shaft absorbs the energy, converts it to heat, and the heat damages the follicle’s regenerative cells at the base. Over a series of sessions, the follicles that were in their active growth phase at the time of treatment are progressively disabled.
Three wavelengths handle the full range of human skin and hair:
- 755 nm alexandrite — the strongest melanin absorber; ideal for skin types I–III with pigmented hair.
- 810 nm diode — middle ground; works across a wider range of skin types.
- 1064 nm Nd:YAG — penetrates deeper, melanin absorption is lower, which is exactly what you want for skin types IV–VI. This is the wavelength that makes safe hair removal possible for darker skin.
The laser cannot see hair without melanin. White, gray, and very blond hairs do not respond. Red hair responds inconsistently. Brown and black hair on any skin type respond well — provided the wavelength is matched correctly.
How Dr. Brown approaches it
Wavelength selection by skin type is the single most important variable in laser hair removal. The wrong wavelength on the wrong skin type causes burns, blisters, and post-inflammatory hyperpigmentation. The right wavelength at the right fluence works cleanly.
Esvie protocol:
- Skin type assessment. Fitzpatrick type, current pigmentation status (recent sun, active tan), and hair color/density.
- Wavelength selection. 755 nm or 810 nm for lighter skin types with pigmented hair; 1064 nm for skin types IV–VI.
- Test pulse for darker skin. A test in a discreet area before the first full treatment for skin types IV–VI.
- Series planning. Six to eight sessions spaced four to six weeks apart on the face, six to eight weeks apart on the body. Hair grows in cycles; only follicles in the active growth phase at the time of treatment are killed, which is why a series is required.
Hormonally-driven hair — chin and jawline hair in PCOS, perimenopausal facial hair, hair driven by certain medications — requires longer maintenance. Honest expectation-setting at the consult: the laser kills the follicles it sees, but a body that is producing new hair from new follicles will keep producing them.
What to expect
Pre-treatment. Shave the area 24 hours before the appointment — not weeks before. Do not wax, pluck, thread, or epilate for at least four weeks before each session; the hair shaft must be inside the follicle for the laser to reach the target. Avoid sun exposure for two weeks before. Skip retinoids and exfoliating acids for several days before.
Day of treatment. Topical numbing cream may be applied to sensitive areas. Eye shields placed. The handpiece delivers cooled pulses across the treatment area. Most patients describe the sensation as a quick rubber-band snap with cool air or contact cooling between pulses. Most areas finish in 5–20 minutes; full legs or back run longer.
Immediately after. Mild redness and a slight bumpy texture around the follicles for a few hours, occasionally up to 24 hours. The treated hair does not fall out instantly — over the next one to two weeks, the dead hairs work their way out as the skin sheds. Do not pluck or wax during this period; gentle exfoliation is fine.
Between sessions. Visible reduction is typically apparent after the second or third session. Each subsequent session catches the follicles that were dormant during the previous one. The full series of six to eight sessions takes six to twelve months.
Long term. Most patients reach permanent reduction of 70–90 percent of treated hair after a complete series. Maintenance one to two times per year is common, especially for hormonally-driven areas.
Candidacy
Good candidates have unwanted pigmented (brown or black) hair, are not pregnant, do not have an active tan on the treatment area, and are willing to commit to a series spaced over months. Skin type does not exclude you — wavelength selection does the work.
Not a candidate if your hair is white, gray, or very blond — there is no melanin target. Not a candidate if you are pregnant; come back after delivery and after hormonal patterns settle. Not a candidate if you have an active tan, recent unprotected sun exposure on the area, or are within six months of isotretinoin therapy.
Alternatives — shaving, waxing, threading, electrolysis — remain options. Electrolysis is the only modality that works on hair without melanin and remains the right answer for white or gray hair.