What should you know about TCA CROSS technique?

TCA CROSS stands for chemical reconstruction of skin scars. During the procedure, a trained clinician identifies individual scar openings and applies a high-strength trichloroacetic acid solution to the scar surface with a fine applicator. The aim is to limit the chemical injury to the scar rather than spread it over surrounding skin. A temporary frosting or whitening change may appear during application, followed by redness, sensitivity, darkening, and a small crust as the area repairs.

The technique is different from a conventional chemical peel, which is spread over a larger area to affect the skin surface more broadly. TCA CROSS is generally considered for narrow, deep depressed scars; rolling scars, broad depressions, and raised scars may require other methods or a combined plan. Skin tone and previous pigment changes matter when selecting treatment.

Before treatment, tell the clinician about active acne, eczema, recent tanning, cold sores, medicines, and a tendency to develop dark marks or raised scars. On the day, arrive with clean skin and avoid applying unapproved products. Afterwards, keep the area clean, do not remove crusts, and use only the products recommended for healing. Shield the skin from sunlight and delay exfoliants, retinoids, waxing, and vigorous rubbing until the clinician says the surface is ready.

Report worsening pain, spreading redness, marked warmth, pus-like drainage, fever, extensive blistering, or swelling near the eyes. Get urgent help if swelling interferes with breathing or vision. Contact the clinic about delayed closure, persistent pigment change, or a new raised scar so the area can be examined.

Ask how the applicator will be limited to each scar, which scars are unsuitable, what healing changes are expected, and how your skin tone or pigment history changes the plan. Clarify aftercare and the point at which other scar treatments may be added.