TCA and trichloroacetic acid: what to know

TCA changes proteins in the treated skin, prompting shedding and a repair response. The same ingredient can be used in different ways: a superficial peel over a wider area, or precise application such as [TCA CROSS](/treatments/aesthetic-procedures/tca-cross/) inside selected acne scars. A [Chemical Peel](/treatments/aesthetic-procedures/chemical-peel/) should match the concern and the desired depth.

Redness, tightness, flaking, crusting and temporary color change are possible. Deeper injury can mean more recovery and greater risk of infection, scarring or uneven pigmentation. Pregnancy, active irritation, infection, recent sun exposure, eczema and a history of abnormal scarring should be discussed before treatment.

Ask who will perform the procedure, which formulation and depth are planned, and whether your skin tone or medical history changes the approach. Bring a complete list of medicines and products. Do not use online recipes or apply concentrated TCA to the face, eyelids or scars without professional guidance.

During healing, cleanse gently, use the recommended bland moisturizer or ointment, avoid picking and pause irritating actives until cleared. Protect recovering skin from ultraviolet exposure, since inflammation and sunlight can intensify pigment changes.

Contact the provider for increasing pain, warmth, swelling, pus, spreading redness, blisters or fever. Seek urgent help after eye exposure, breathing difficulty or rapidly worsening facial swelling. A clinician should review wounds or pigment changes that do not follow the expected healing pattern.

What problem is TCA intended to treat, and what depth is appropriate? What alternatives are available? Which products or medicines should I pause, how will the area be protected, and what is the plan if irritation or pigment change develops?