TCA acid
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Trichloroacetic acid (TCA) is an organic chemical compound from the group of carboxylic acids, widely used in dermatology and aesthetic medicine as an exfoliating substance with controlled keratolytic and protein-coagulating action. Depending on the concentration used, it causes superficial, medium-depth, or deep damage to the epidermis and dermis, initiating regenerative processes, collagen remodeling, and improvement of skin structure. TCA acid is one of the best-studied substances used in medical peels, showing high effectiveness in the treatment of many dermatological problems.
TCA acid – what is it
Trichloroacetic acid is a derivative of acetic acid in which three hydrogen atoms have been replaced by chlorine atoms, which significantly increases its biological activity. This substance is characterized by a strong protein-denaturing effect, leading to the coagulation of cellular structures at the site of application.
The mechanism of action of TCA consists of:
- controlled damage to the epidermis and dermis,
- coagulation of keratinocyte proteins,
- stimulation of inflammatory and repair processes,
- induction of neocollagenesis (formation of new collagen fibers),
- acceleration of cellular renewal.
The depth of acid penetration depends primarily on its concentration:
- 10–20% – superficial peel,
- 20–35% – medium-depth peel,
- 35% – deep peel (used less frequently due to a higher risk of complications).
A characteristic sign of TCA action is the so-called frosting, which is the whitening of the skin resulting from protein denaturation. It is a clinical indicator of the depth of the preparation's action.
TCA acid – application
TCA acid is widely used in the treatment of dermatological conditions and in aesthetic medicine procedures, especially where the goal is to improve skin structure and reduce pathological changes.
The main indications include:
1. Acne and post-acne lesions
- reduction of comedones and inflammatory lesions,
- smoothing of atrophic scars,
- reduction of seborrhea.
2. Skin discolorations
- melasma (chloasma),
- post-inflammatory hyperpigmentation,
- lentigines,
- solar hyperpigmentation.
3. Photoaging
- fine and medium wrinkles,
- loss of skin firmness,
- uneven structure and tone.
4. Keratosis and hyperkeratotic lesions
- actinic keratosis,
- excessive epidermal keratosis.
5. Enlarged pores and uneven skin texture
6. Stretch marks (striae distensae)
- especially in combination therapy.
It is worth emphasizing that TCA is one of the few acids that allow for effective action within the deeper layers of the skin, making it an important tool in the therapy of more advanced dermatological problems.
TCA acid – treatments
TCA acid peels are medical procedures that should be performed by experienced specialists due to the possibility of deep penetration and potential risk of complications.
The course of the procedure includes:
- thorough skin cleansing and degreasing,
- application of the TCA preparation in the appropriate concentration,
- observation of the skin's reaction (including frosting),
- completion of the procedure without neutralization (TCA is self-neutralizing),
- application of soothing and regenerating preparations.
Procedure characteristics:
- duration: 15–30 minutes,
- no neutralization required (unlike many other acids),
- recovery period depending on the depth of the peel (from a few days to 2 weeks).
Possible sensations after the procedure:
- burning and a feeling of skin tightness,
- erythema,
- sheet-like peeling of the epidermis,
- transient hypersensitivity.
In clinical practice, TCA acid is often used in combined therapies, which increases its effectiveness. Among the procedures used concurrently are:
- chemical peels with different mechanisms of action,
- microneedle mesotherapy,
- fractional laser therapy,
- microneedle radiofrequency,
- treatments stimulating skin remodeling.
Such an approach allows for multi-level action – both on the skin surface and in its deeper layers.
TCA acid – effects
TCA acid effects result from controlled skin damage and the subsequent activation of regenerative processes. Extracellular matrix remodeling, including the synthesis of type I and III collagen and elastin, plays a key role here.
Key therapeutic effects:
- smoothing of the skin structure,
- reduction of wrinkles and fine lines,
- lightening of discolorations and evening out the skin tone,
- reduction in the visibility of scars (especially post-acne scars),
- narrowing of pores,
- improvement of skin tension and elasticity,
- overall revitalization and rejuvenation of the skin.
The effects depend on:
- the concentration of the acid used,
- the number of treatments performed,
- individual skin regeneration capabilities,
- adherence to post-treatment recommendations.
Time for results to appear:
- the first results are visible after the peeling process is complete (approx. 7–14 days),
- full skin remodeling occurs within a few weeks to months.
Possible side effects:
- post-inflammatory hyperpigmentation (especially in individuals with higher phototypes),
- secondary infections,
- scarring (rarely, if performed incorrectly),
- prolonged erythema.
For this reason, proper patient qualification and conducting the therapy according to current medical standards are of key importance.