What Is a TCA Chemical Peel?

Trichloroacetic acid (TCA) is a commonly used agent for chemical peeling and has the potential to decrease the appearance of sunspots and fine lines. Chemical peeling removes the outer layer of skin generating new cell growth and collagen formation that results in younger looking skin. Depending on the concentration and application, TCA peels can target superficial to deeper layers of skin. Generally these concentrations range from 10-50%. In California, TCA peels greater than 20% should only be applied by board-certified healthcare professionals specializing in plastic surgery or dermatology and who are experienced with deep chemical peels. These concentration requirements vary from state to state. The concentration Downtime for TCA peels is typically 5-7 days during which time treated skin appears to “slough” off. Patients with darker skin may benefit from pre-treatment with topical retinoids (i.e. Retin-A or Renova) and/or hydroquinone to reduce the risk of post-treatment darkening of the skin, which is the most common side effect. For all skin types extensive measures must be taken to avoid sun exposure after treatment, especially during the first two weeks.

Clinical Context

TCA peels work by causing controlled removal of the skin's outer layers, prompting fresh, smoother skin to grow in its place. The process resembles a chemical burn: treated skin turns red, feels tight, then flakes off over several days. Deeper peels reach further into the skin and need longer healing with stricter aftercare. Because peel depth is hard to control precisely, choosing an experienced, appropriately trained provider matters — going too deep can risk scarring or lasting pigment changes.

Answered By

Dr. Steven Williams

President Emeritus of ASPS

Dr. Steven Williams is a board-certified plastic and reconstructive surgeon, a diplomate of the American Board of Plastic Surgery, the Past President of the prestigious American Society of Plastic Surgeons, and a charitable person who dedicates his life to those in need of his unique expertise.

TCA Peel