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TCA-based blue peel: a standardized procedure with depth control.

BACKGROUND
Trichloroacetic acid (TCA) peels are popular, well known, and widely utilized to correct a variety of skin problems. Different methods exist, ranging from the use of plain TCA to augmented or modified TCA at concentrations ranging from 30% to 50%. However, peel results vary depending upon the physician skill level, patient selection, and patient management.


OBJECTIVES
The purpose of this article is to fill the gap for a peel that is deeper than superficial exfoliative procedures yet lighter than a medium-depth peel, to simplify and standardize the TCA peel, to define depth properly based on intraoperative clinical signs, to implement a color guide that facilitates even application of TCA and avoids skip areas, and to identify and minimize variables that may contribute to inconsistent outcomes.


METHODS
A coating system for TCA application is created by selecting a specific TCA concentration (15% or 20%), TCA volume (4 or 6 ml, respectively), and a standardized body surface area to be peeled (5%), taking into consideration skin thickness and fragility. Multiple coats of TCA are applied to reach the desired endpoints: papillary dermis (light Blue Peel) or the immediate upper reticular dermis (light/medium Blue Peel). Clinical signs guide the depth achieved (frost quality, even blue, pink sign, epidermal sliding) and correlate retrospectively with healing time (7-10 days).


RESULTS
The TCA Blue Peel was found to be a simple and consistent treatment approach for problems related to the epidermis, papillary dermis, and immediate upper reticular dermis. An unexpected benefit was the appearance of skin tightening and a reduction of skin laxity in many cases. This suggests that the papillary dermis and the immediate upper reticular dermis play a significant role in skin tightness.


CONCLUSION
A simple coating system for achieving depth-controlled TCA peels is presented with correlation to intraoperative clinical signs. This method makes it easier to peel skin of all racial backgrounds, including nonfacial skin. This is especially useful for many patients previously excluded from having procedures that penetrate beneath the papillary dermis. Commonly encountered variables in chemical peels are presented which may affect outcome.