Q-Switched Laser Treatment Guide For Pigmentation And Tattoo Removal
Oct 23, 2025
Principle of Q-Switched Laser
The Q-Switched laser delivers high-intensity light energy in extremely short pulses. When the beam targets the pigmented area, melanin particles selectively absorb the energy, rapidly expanding and breaking into tiny fragments. These fragments are then naturally removed through the body's immune system, specifically via macrophage activity. This selective photothermal effect ensures treatment precision while minimizing damage to surrounding tissue.
Main Applications
- Tattoo removal (black, blue, and colored pigments)
- Pigmentation removal (freckles, age spots, melasma)
- Skin rejuvenation and whitening
- Carbon laser facial (Black Doll / White Doll)
Wavelength Selection
- 532 nm: Superficial pigmentation, red/orange tattoos, freckles, age spots (higher risk of post-inflammatory hyperpigmentation)
- 1064 nm: Deep pigmentation, dark tattoos, dermal spots, melasma
- 1320 nm: Carbon laser peel for skin whitening and pore refinement
- 755 nm: Skin tone correction, mild rejuvenation, superficial pigmentation
Treatment Parameters
| Condition | Wavelength | Energy (mJ) | Spot Size (mm) | Frequency (Hz) |
|---|---|---|---|---|
| Epidermal pigment (freckles, age spots) | 532 nm | 100–200 | 2–4 | 1–3 |
| Dermal pigment (melasma, Ota nevus) | 1064 nm | 150–300 | 4–6 | 1–2 |
| Deep black/blue tattoo | 1064 nm | 200–350 | 2–4 | 1–5 |
| Red/orange tattoo | 532 nm | 150–200 | 2–4 | 1–3 |
| Atrophic scar | 1064 nm | 200–300 | 4–6 | 1–3 |
| Hypertrophic scar | 532 nm | 150–200 | 3–5 | 1–2 |
| Fine lines, rejuvenation | 1064 nm | 150–250 | 6–8 | 1–2 |
| Pores, texture improvement | 1064 nm | 200–300 | 6–8 | 1–3 |
Operation Procedure
1.Preparation:
- Clean the treatment area and take pre-treatment photos.
- Apply numbing cream for larger areas.
- Prepare safety goggles, saline, alcohol, gloves, and mask.
2.Parameter Testing:
- Start with low energy and test on the target area.
- Gradually increase energy by 50mJ or adjust handpiece distance until lightening of pigmentation is visible.
- Maintain 30%–50% overlap for uniform coverage.
3.Post-Treatment Care:
- Apply burn cream and cool compress for 30–60 minutes.
- Avoid washing the treated area for 1–5 days.
- Use medical repair mask daily for 7 days (for facial treatment).
- Do not remove scabs manually.
- Avoid heat exposure, intense exercise, spicy food, alcohol, and seafood for one week.
- Use physical sun protection (hat, mask) and hydrating skincare for 1–3 months.
Precautions
- Do not perform the procedure during pregnancy, lactation, or when the skin is damaged, infected, or allergic.
- Patients with photosensitivity, recent filler injections (within 3 months), or severe systemic diseases should avoid treatment.
- Melasma during the active phase should not be treated with lasers.
- Slight redness, pinpoint bleeding, or temporary pigment darkening may occur-these are normal reactions that fade gradually with metabolism.
Treatment Course
- Darker skin tones may require more sessions due to higher melanin absorption.
- Larger areas require multiple treatments.
- Picosecond or ultrashort pulse lasers usually show visible results after 1–5 sessions, while traditional Q-switched lasers may need 5–10 sessions.
- Colored tattoos may need additional treatments for complete clearance.
Conclusion
The Q-Switched laser remains a reliable and versatile solution for pigmentation correction, tattoo removal, and skin rejuvenation. By following precise wavelength selection, parameter adjustment, and post-care guidance, practitioners can deliver safe and consistent treatment outcomes for patients with various skin conditions.
