Trichloroacetic acid (TCA) is a chemical that is commonly used in dermatology for a variety of skin treatments, including chemical peels, scar revision, and the treatment of hyperpigmentation. TCA is a stronger chemical peel than glycolic acid or salicylic acid peels and is often used for deeper peels.

During a TCA peel, the acid is applied to the skin in a thin layer and left on for a specific amount of time. The duration of time for which TCA is left on the skin can vary depending on the specific needs and concerns of the patient and the desired results.

In general, TCA peels are classified as superficial, medium, or deep, based on the concentration of the acid and the depth of the peel. Superficial peels, also known as lunchtime peels, typically involve a lower concentration of TCA and are left on the skin for a shorter period of time, usually between 5 and 10 minutes. These peels can be repeated every few weeks or months as needed. Medium peels, also known as medium-depth peels, typically involve a higher concentration of TCA and are left on the skin for a longer period of time, usually between 15 and 20 minutes. These peels can be repeated every 6 to 12 months as needed.

As the acid is left on the skin, it begins to dissolve the bonds that hold the dead skin cells together. When the TCA is neutralized and removed from the skin, the exfoliated cells are also removed, revealing healthier skin underneath.

TCA peels can be used on the face, neck, and hands, and can be tailored to the specific needs and concerns of the patient. They are often used to improve the appearance of fine lines and wrinkles, acne scars, and uneven skin tone.

It’s important to note that TCA peels can cause some skin irritation, especially in people with sensitive skin. It is important for patients to discuss the potential risks and benefits of the treatment with their dermatologist before undergoing the procedure.