Treatment of cosmetic tattoos with nonablative fractional laser in an animal model: A novel method with histopathologic evidence

Chia Chen Wang, Chuen Lin Huang, Shao Chen Lee, Yuh Mou Sue, Fur Jiang Leu

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Background and Objective Cosmetic tattoos are difficult to treat using Q-switched lasers. We introduce a novel method for the treatment of cosmetic tattoos using a nonablative fractional laser and investigate the underlying pathophysiological mechanisms in an animal model. Study Design/Materials and Methods Ten rats were tattooed on their backs with white and flesh-colored pigments. One-half of each tattoo was treated with a 1,550-nm, erbium:glass fractional laser system with energy settings of 17 mJ and 169 MTZ/cm2 × 2 passes for five sessions at 1-month intervals. The untreated half of each tattoo served as the control. An independent physician reviewed the photographs and scored the clinical response. Serial skin samples were obtained at baseline and at various times after laser treatment. These tissue sections were stained with hematoxylin and eosin, and immunostained for types I, III, and IV collagen; laminin; fibronectin; and α-smooth muscle actin. Results White tattoos showed excellent responses in two rats and good responses in eight rats, whereas flesh-colored tattoos showed excellent responses in four rats and good responses in six rats (P = 0.001 in both cases compared with baseline). Both tattoos exhibited a similar clearance rate (P > 0.05) and histological reactions. Microscopic epidermal necrotic debris (MEND) containing tattoo pigments and collagen fibrils appeared on day 1, increased on day 2, and was exfoliated after 5 days. The dermal-epidermal junction lost integrity 30 minutes after treatment, but recovered completely on day 3. The expression of fibronectin and collagen-III, which play key roles in wound healing, increased around the microscopic treatment zone on days 1-5 and 4-7, respectively. A few myofibroblasts appeared on days 4-7. Conclusion Nonablative fractional lasers (NAFLs) successfully remove cosmetic tattoos by transepidermal elimination of tattoo pigments through the disrupted dermal-epidermal junction. This action is facilitated by the wound healing process.

Original languageEnglish
Pages (from-to)116-122
Number of pages7
JournalLasers in Surgery and Medicine
Issue number2
Publication statusPublished - Feb 2013


  • cosmetic tattoo
  • fractional photothermolysis
  • nonablative fractional laser
  • tattoo
  • transepidermal elimination

ASJC Scopus subject areas

  • Surgery
  • Dermatology


Dive into the research topics of 'Treatment of cosmetic tattoos with nonablative fractional laser in an animal model: A novel method with histopathologic evidence'. Together they form a unique fingerprint.

Cite this