What is TCA CROSS
TCA CROSS treats ice pick acne scars by placing a high-strength acid at the base of each pit to rebuild collagen from the bottom up. Most people need two to three treatments, with five to seven days of recovery each, and improvement typically ranges from 50 to 80 percent.
TCA Cross is a minimally invasive technique designed to treat depressed acne scars, such as ice-pick and smaller boxcar scars. The treatment is often considered for scars that are difficult to treat with other methods, such as laser therapy.
TCA CROSS treats the ice pick scars. The boxcar and rolling scars around them usually need the other treatments in the acne scar treatment guide.
How TCA CROSS rebuilds an ice pick scar
TCA Cross works by leveraging the skin’s natural repair mechanism to address deep scarring.
- Creates Controlled Chemical Injury: The precise application of the high-concentration TCA solution creates a controlled chemical injury localised to the scar tissue.
- Stimulates Healing Response: This injury immediately triggers the body’s natural wound-healing response, prompting the generation of new collagen fibres beneath the treated area.
- Lifts and Smoothes Scars: The new collagen remodels the tissue, gradually lifting the base of the indented scar to be more level with the surrounding skin. This smoothing effect improves the appearance of deep scars.
The TCA Cross treatment in Singapore is a targeted, effective solution for deep scars.
Which Acne Scars TCA CROSS Treats: Ice Pick Scars and Deep Pits
TCA CROSS exists for ice pick scars. These are the narrow, deep scars that look like the skin has been punctured with a needle, often on the cheeks and temples, and they are the one scar type that resurfacing lasers handle badly. A laser works across the surface, while an ice pick scar runs deep and narrow, so treating it from above would mean destroying healthy skin around it to reach the base. TCA CROSS goes the other way, placing a high concentration of trichloroacetic acid into the scar itself so the base lifts while the surrounding skin is untouched.
Ice-Pick Scars
TCA Cross works well for these narrow, deep scars by stimulating collagen from the base to elevate the scar walls.
Boxcar Scars
This treatment is effective for shallow to medium boxcar scars by lifting the base of the scar to blend with the surrounding skin.
Rolling Scars
While primarily treated with subcision, TCA Cross can be used on rolling scars when they have a deep, defined central indentation.
Who is suitable for TCA CROSS, and who is not
TCA Cross treatment in Singapore is an excellent option for many patients, but it is not suitable for everyone.
Ideal Candidates:
- Individuals with deep, narrow, depressed scars, primarily ice-pick and some boxcar scars.
- Patients with stable skin who are seeking a highly targeted treatment with minimal downtime.
- Adults who are able to comply strictly with post-treatment sun avoidance.
Not Suitable For:
- Patients with active skin infections, inflammation, or cystic acne in the treatment area.
- Individuals with a history of keloid scarring.
- Pregnant or nursing patients.
Raised scars that grow beyond the original wound are keloids, a different problem from pitted acne scars. See my guide to keloid scars and the options for keloid treatment in Singapore.
TCA CROSS treatment in Singapore, step by step
Step 1: Consultation & Skin Assessment
Dr Ee will thoroughly evaluate your acne scars, focusing on their type and depth, and discuss your aesthetic goals to confirm the suitability of TCA Cross.
Step 2: Preparation
Your skin will be cleansed to remove dirt and make-up, ensuring the area is sterile and prepared for the procedure.
Step 3: TCA Application
Dr Ee will use a fine instrument to apply the concentrated TCA solution directly and precisely into the base of each individual scar, initiating the controlled chemical injury.
Step 4: Immediate Post-Treatment Effects
Immediately following application, the treated scar tissue will turn white or “frost”—a temporary effect that signals the start of the collagen-stimulating process. Mild redness and peeling will follow.
TCA CROSS in Singapore with Dr Gerard Ee
MBBS (UK), MRCS (Edinburgh), PGDip Practical Dermatology (Cardiff)
Dr Gerard Ee is an experienced aesthetic physician with comprehensive medical qualifications. He earned his medical degree (MBBS) from St George’s University of London, completed further training to become a member of the Royal College of Surgeons (MRCS) in Edinburgh, and completed a Postgraduate Diploma in Practical Dermatology at Cardiff University.
Dr Ee has extensive experience in aesthetic procedures, with a focus on evidence-based acne treatment, acne scar laser treatments, and skin rejuvenation. His patient-centred approach involves taking the time to understand your specific concerns to create personalised treatment plans for the best possible outcome.
TCA CROSS before and after, what to expect
Within seconds of application, the treated pits turn white as the acid coagulates the proteins in the scar wall, then redden and form small scabs that shed over five to seven days. Each pit fills from its base as new collagen forms, so the change after one session is slight, and the result builds across two to three treatments spaced four to six weeks apart. Over a full course, deep ice pick scars can become 50 to 80 per cent shallower, and improvement continues for several months after the last session. Photographs are taken under identical angled lighting at each visit, as consistent lighting is the only reliable way to measure a gradual change in scar depth. Once the pits are shallower, fractional CO2 or Fraxel 1550 can refine the surrounding texture. The fee for TCA CROSS is quoted at consultation and depends on the number of scars treated.
Frequently Asked Questions About TCA CROSS
How effective is TCA Cross?
Patients generally experience a 50-80% improvement in deep ice pick scars after a series of 2-3 TCA Cross treatments. The scars become shallower and less noticeable, particularly in different lighting and shadows. Scar improvement continues over several months following the procedure. Once deep acne scars are raised to a more shallow level, lasers such as Fraxel may be used to complete the acne scar revision process.
Is TCA Cross for acne scars painful?
The procedure is minimally uncomfortable, with most patients reporting a mild, temporary stinging sensation as the TCA works on the scars. Local anaesthetic is typically not required.
What are the risks or side effects of TCA Cross?
Common side effects of TCA Cross include redness, peeling, and mild swelling, which typically resolve within a week. More rarely, there is a risk of hyperpigmentation (darkening of the skin), scarring, or infection. These risks can be minimised by following post-treatment care guidelines, such as avoiding sun exposure and applying prescribed creams to aid healing. Dr Gerard’s extensive experience performing TCA Cross helps ensure the treatment is applied precisely, reducing the likelihood of complications and optimising results.
What is the downtime for TCA Cross for acne scars?
The treated areas will appear “frosted” for several hours after the procedure, followed by redness that lasts for several days. The treated areas typically remain red for 3-4 days before shedding or peeling. Full recovery is expected within 5-7 days.
What should I expect during recovery from TCA Cross?
During recovery, the treated areas may initially appear white or “frosted” for a few hours post-procedure. Redness and swelling typically follow and last for 3-4 days. Scabbing or crusting may develop as the skin begins to peel and heal. By the end of the first week, most patients notice that peeling subsides, and the skin continues to recover, with final healing expected in 5-7 days. Full recovery depends on the depth of the scars and adherence to aftercare instructions.
Can TCA Cross work on all skin types?
Yes, TCA Cross is safe for all skin types, including Asian and darker skin tones. However, in darker-skinned patients, there is an increased risk of post-procedure darkening, where treated areas may appear darker than the surrounding skin for weeks to months. The use of sunscreen or fading creams can help reduce this risk. An extra 1 or 2 TCA Cross sessions may be needed for darker skin, as the concentration of TCA is modified to minimise the chances of prolonged post-inflammatory hyperpigmentation.
Can I reduce pore size with TCA Cross?
Yes, in cases of enlarged pores, 2-3 TCA Cross treatments may be required to achieve a noticeable reduction in pore size.
Combining TCA Cross & lasers for acne scars?
TCA Cross can be used as a stand-alone procedure to treat enlarged pores or as a preparatory step for laser resurfacing in the treatment of deep acne scars. Techniques such as subcision, lasers, and punch elevation can be combined to achieve optimal results, depending on the type of scars and the patient’s skin condition. Once the depth of scars is levelled, laser treatment can further refine the results.
Find out more about the Fraxel Laser treatment in Singapore.
Is TCA Cross treatment safe?
Yes, when performed by an experienced medical professional like Dr Gerard Ee, TCA Cross treatment is generally safe. The procedure is highly targeted to minimise impact on surrounding healthy skin.
How many TCA Cross sessions are needed?
The number of TCA Cross sessions required typically ranges from 2 to 4, spaced 4 to 8 weeks apart, depending on the severity of the acne scars and the individual patient’s response to treatment.
Ready to achieve smoother skin? Call or WhatsApp us now to schedule your TCA Cross consultation!
Are ice pick scars the hardest acne scars to treat?
They are the least responsive to lasers, which is why they are often described that way. Treated with TCA CROSS over several sessions they do improve, and in my experience they respond better than most patients expect, though ice pick scars usually need more sessions than rolling or boxcar scars.
Do ice pick scars go away on their own?
No. An ice pick scar is a permanent loss of collagen through the full depth of the dermis, and there is no natural process that rebuilds it. Redness around a recent scar fades, which can make the scar look less obvious over the first year, but the indentation itself remains until it is treated.
What causes ice pick scars?
Deep inflammation. When a cyst or a deep inflamed lesion destroys tissue faster than the body can rebuild collagen, healing pulls the surface down into a narrow tract rather than filling it. Picking or squeezing deep lesions increases the inflammation and makes this outcome more likely.
Can ice pick scars be treated without a procedure?
No. Creams, serums and peels work on the skin surface, and an ice pick scar runs deep and narrow, so nothing applied on top reaches the base of it. TCA CROSS, which places acid inside the scar itself, is the treatment designed for this shape.
Dr Gerard Ee consults and performs this treatment at The Clifford Clinic, 50 Raffles Place, Singapore.
Book a consultation with Dr Gerard Ee at The Clifford Clinic
Dr Gerard Ee consults and performs TCA CROSS at The Clifford Clinic, 50 Raffles Place, Singapore. Consultations are by appointment. Message the clinic on WhatsApp, or call 6532 2048.
