Temporary dermal scatter reduction: quantitative assessment and implications for improved laser tattoo removal.
OBJECTIVE
Temporary dermal clearing, i.e., reduction in the attenuation coefficient of the dermis and epidermis, may lead to improved laser tattoo removal by providing increased efficiency of laser delivery to embedded ink particles and enabling the use of shorter wavelength visible lasers more effective on certain inks.


METHODS
In a hairless guinea pig model of human tattoo, we tested both intradermal and transdermal application of glycerol, using visual inspection, spectral analysis, and optical coherence tomography techniques to assess effectiveness. In controlled experiments, we compared the outcomes of single laser treatment sessions for both cleared and uncleared tattoo sites using Q-switched 755 and 532 nm lasers on three different inks.


RESULTS
Intradermal injection of clearing agents induced dermal clearing but resulted in necrosis and scar. Transdermal application of clearing agents resulted in moderate reversible clearing, which was localized to the superficial layers of the skin and did not result in complications. Statistically significant differences in laser treatment outcome were observed relative to a number of treatment parameters including the treatment of certain tattoos by short wavelength lasers.


CONCLUSIONS
Temporary clearing of superficial skin layers may be performed in an apparently safe and reliable manner. Clearing should lead to increased penetration of laser light to tattoos and should, therefore, increase treatment efficiency. Further study is needed to determine the degree to which this change is of clinical value.
McNichols
Roger J
RJ
BioTex, Inc., Houston, Texas 77054, USA. roger@biotexmedical.com
Fox
Matthew A
MA
Gowda
Ashok
A
Tuya
Shilagard
S
Bell
Brent
B
Motamedi
Massoud
M
D000818:Animals; D003879:Dermatologic Agents / Q000494:pharmacology; D020405:Dermis / Q000187:drug effects / Q000528:radiation effects*; D005240:Feasibility Studies; D005990:Glycerol / Q000494:pharmacology; D006168:Guinea Pigs; D007281:Ink; D007834:Lasers; D028022:Low-Level Light Therapy; D023421:Models, Animal; D010782:Photolysis / Q000187:drug effects / Q000528:radiation effects*; D012542:Scattering, Radiation; D013653:Tattooing; D016896:Treatment Outcome
D003879:Dermatologic Agents; D005990:Glycerol