CLS Tattoo Removal and Pigmentation Treatment

Question 1

What is the primary mechanism by which Q-switched lasers remove tattoo ink?

Accepted Answer

Photoacoustic (photomechanical) fragmentation of ink particles into smaller pieces that can be cleared by phagocytes

Answer

Q-switched lasers deliver ultra-short nanosecond pulses that create a rapid thermal expansion and contraction (photoacoustic effect) that mechanically shatters ink particles into smaller fragments. These micro-fragments are subsequently phagocytosed and carried away by macrophages and lymphatic drainage over weeks to months.

Question 2

Which Q-switched laser wavelength is most effective for removing black and dark blue tattoo ink?

Accepted Answer

1064 nm Nd:YAG Q-switched

Answer

Black and dark blue inks absorb light across a broad spectrum. The 1064 nm Q-switched Nd:YAG is the most commonly used wavelength for dark inks because it penetrates deeply (ink can be in deeper dermis), is less absorbed by epidermal melanin (reducing dyspigmentation risk), and delivers high peak power. 694 nm and 755 nm are also effective but carry higher epidermal melanin interaction.

Question 3

Red tattoo ink is best treated with which laser wavelength and why?

Accepted Answer

532 nm KTP or Q-switched Nd:YAG second harmonic, because red ink strongly absorbs green light

Answer

Red pigment absorbs green light (its complementary color) strongly. The 532 nm wavelength (KTP laser or frequency-doubled Nd:YAG) is therefore preferentially absorbed by red ink, generating sufficient photoacoustic energy to fragment red pigment particles while minimizing collateral tissue effects.

Question 4

Immediately after Q-switched laser tattoo treatment, frosting (white discoloration) appears over the treated tattoo. What is the physiological basis of this finding?

Accepted Answer

Rapid vaporization of water within ink particles creates CO₂ and steam microbubbles that scatter light

Answer

Frosting after Q-switched laser tattoo treatment is caused by rapid vaporization of water within and around ink granules, forming steam and CO₂ microbubbles in the dermis. These scatter light back to the surface, appearing as white frosting. It is a therapeutic endpoint indicating adequate energy absorption. It resolves within 10–20 minutes as bubbles are reabsorbed.

Question 5

Why do amateur tattoos typically respond better to laser removal than professional tattoos?

Accepted Answer

Amateur tattoos contain fewer ink colors and are placed more superficially with lower ink density, making them easier to fragment and clear

Answer

Professional tattoo artists deposit ink deeply, densely, and uniformly in the dermis using consistent technique. Amateur tattoos are placed irregularly, often more superficially and with lower ink density. The lower total ink load and shallower location make amateur tattoos respond more quickly and completely to laser treatment.

CLS - Certified Laser Specialist Practice Test

CLS - Certified Laser Specialist Practice Test

CLS Tattoo Removal and Pigmentation Treatment