TCA CROSS for Ice-Pick Acne Scars: Results, Crusting, and Hyperpigmentation Risk

TCA is a chemical peeling agent that coagulates proteins. The CROSS technique precisely contacts only the scar base with a very small amount, producing a white coagulation response and inducing dermal remodeling during recovery. Higher concentration is not automatically better; the applied amount, contact area, skin tone, and repeat interval determine safety and results.

The depth and shadow of appropriately selected ice-pick scars and narrow boxcar scars may improve over multiple sessions. Subcision may be more suitable for broad rolling scars and adhesions, while fractional laser or RF microneedling may be more appropriate for surface texture. A realistic goal is gradual reduction through combination treatment of multiple scar types, not complete removal.

Patients with ice-pick scars whose active acne is stable and who can follow crust and sun-protection care may seek consultation. Recent tanning, active infection, dermatitis or herpes, keloids, impaired wound healing, a history of severe PIH or hypopigmentation, pregnancy or breastfeeding, and recent isotretinoin, strong peels, or laser treatment require separate assessment of timing and risk.

The scars are magnified and classified as ice-pick, boxcar, or rolling scars, then cleansed and degreased before a small amount is applied only inside each scar. The white frosting quickly disappears, and a brown crust may generally remain for about 5–10 days; redness and pigmentation may last longer. Do not pick the crusts or use acids or scrubs; moisturize and use sun protection.

In addition to pain, redness, and crusting, possible complications include burns to normal skin, widening or merging of scars, infection, persistent erythema, hyperpigmentation, and hypopigmentation. High-concentration TCA used at home is dangerous because concentration and application depth are difficult to control. Worsening pain, pus, blisters, or black necrotic changes require immediate medical attention.

Q. Is TCA CROSS a full-face peel?

A. No. It is a localized technique that spot-applies TCA only inside selected scars.

Q. How many days does the crust last?

A. It may generally remain for several days to 1 week or longer; forcibly removing it increases PIH and scarring risks.

Q. Can I perform TCA treatment at home?

A. High-concentration acids can cause burns, permanent pigment changes, and scars, so self-treatment is not recommended.

A study of TCA CROSS for acne scars is available on PubMed (https://pubmed.ncbi.nlm.nih.gov/21332915/), along with a 2025 study comparing TCA concentrations (https://pubmed.ncbi.nlm.nih.gov/40072613/). Cases of complications involving worsening scars have also been reported (https://pubmed.ncbi.nlm.nih.gov/34055188/). The American Academy of Dermatology’s guidance on treatment by scar type (https://www.aad.org/public/diseases/acne/derm-treat/scars/treatment) was also consulted.

SEOLREIM Clinic does not explain acne scars with one laser. The doctor personally classifies active acne, ice-pick, boxcar, and rolling scars, and pores, then designs the sequence of TCA CROSS, subcision, fractional laser, and the Silky Pore signature program. Concentration, number of applications, and treatment interval are recorded, and treatment follows SEOLREIM’s principles of authentic products, correct quantities, and attentive care.

Visitors searching for “acne treatment Korea” or “pore treatment Korea” should disclose isotretinoin use and any history of keloids, PIH, or herpes, and state how long they can remain before returning home to monitor crusting. SEOLREIM Clinic is on the 11th floor of the Gangnam 8258 Building, about 1 minute from Exit 3 of Gangnam Station. Appointments can be made through the website’s KakaoTalk consultation, Naver booking, or telephone channels. International visitors should prepare their passport, allergy information, medication list, recent treatment records, and departure schedule, and should confirm available consultation languages and the scope of interpretation support before booking. Depending on the examination findings, same-day treatment may not be possible, or follow-up after returning home may be necessary.

Written by: SEOLREIM Content Editor / Medical review: Completed / Review confirmation date: 2026-10-23 / Publication date: 2026-09-25 / Updated: 2026-10-27. This is general medical information and does not replace individual diagnosis or a treatment prescription.