Can Microcurrent Help Your Scar Tissue?
Do you have an old surgical scar that still feels tight, numb or tender when you move? Maybe it's a knee replacement from a few years ago, an ACL repair from your soccer days, or a C-section scar that still pulls when you stretch.
A scar can keep affecting how you move long after the skin on top has healed. After an injury or surgery, the body rapidly deposits unorganized collagen to close the wound. This disorganized scar tissue lacks flexibility, which can restrict joint motion, bind muscles or fascia together, and cause pain. One of the treatments I use for this in my office is microcurrent electroacupuncture, a very gentle current that may help scar tissue soften and move more freely. Here's what it is, how it might work, and what the research shows so far.
Why scars can keep causing trouble
Healing happens in three overlapping phases: inflammation, proliferation and remodeling. During proliferation, cells called fibroblasts move into the area and lay down collagen to patch the wound. During remodeling, which can last a year or more, that collagen is slowly reorganized and strengthened.
The patch is never quite as good as the original. Normal tissue has collagen fibers lined up neatly, but scar collagen is laid down in a more tangled, haphazard pattern. That makes it stiffer and less stretchy, and even a fully mature scar only regains about 80% of the strength of the tissue it replaced.
Scar tissue can also stick to the layers underneath it, acting a bit like glue between skin, fascia and muscle that are supposed to slide past each other. That's why a scar on the front of your knee can limit how far the knee bends, and why an abdominal scar can tug when you reach overhead. Nerves get caught up in the process too, which is why scars are often numb, oddly sensitive, or both.
A special note about C-section scars
C-sections are one of the most common surgeries in the US, used in nearly a third of births. The scar on the outside may be small, but the surgeon passes through several layers to reach the baby: skin and fat, the fascia along the midline of the abs, the lining of the abdominal cavity (the peritoneum), and the uterus. Not every layer is stitched back together, so the body has to heal them all at once. Afterward, those layers need to slide independently for the core to work well.
When they stick together instead, physical therapist Dr. Anna Hammond of Core Exercise Solutions compares it to plastic wrap that's been heat-shrunk together. Internal adhesions (bands of scar tissue connecting structures inside the abdomen) become much more common with each C-section, rising from about 7% after a first C-section to around 68% after a repeat one (1).
Healing also takes longer than most people expect. At the six-week checkup, the abdominal fascia has only about half of its original strength, and it still isn't fully recovered at six or seven months. Internal scars can keep remodeling for up to two years (1).
This can affect how the whole core works, sometimes for years. The surgery changes both how the tissue moves and the nerve supply to the lower belly, which can make the deepest abdominal muscles (the transverse abdominis and internal obliques) harder to switch on. Many women notice tightness, numbness or oversensitivity at the scar, or a lower-belly "pooch" that doesn't budge no matter how many ab exercises they do. Others never connect their symptoms to the scar at all: low back or pelvic stiffness, constipation, bladder urgency or leaking, or a feeling of heaviness in the pelvic floor.
Here's a simple self-check: Get on your hands and knees and do a slow cat-cow. If arching into the "cow" position feels blocked or uncomfortable around your lower belly, your scar may be part of the story, even if it's been five or ten years. The good news is that it's never too late to work on a scar.
What is microcurrent?
Microcurrent is an extremely gentle electrical current, measured in microamps, or millionths of an amp. For comparison, a TENS unit (the kind physical therapists use for pain) typically runs a thousand times stronger, in milliamps. Microcurrent is usually below what you can feel. Most people just notice that they're relaxed.
Your body already runs on tiny electrical signals. When skin is injured, a small natural electrical field forms across the wound and helps guide cells toward the area that needs repair (2). Microcurrent is in roughly the same range as those signals, which is part of why researchers think it may support healing rather than just block pain.
In microcurrent electroacupuncture, I use acupuncture needles as the contact points for the current. Small clips connect the needles to the device, so the current is delivered right where it's needed, in and around the scar.
How does microcurrent work?
More fuel for repair (ATP)
Most of what we know about the mechanism comes from lab studies on cells and animals. ATP (short for adenosine triphosphate) is the energy currency your cells spend on everything, including rebuilding tissue. In a classic 1982 study, researchers ran different levels of current through samples of rat skin. At around 500 microamps, ATP levels rose about fivefold, and protein synthesis and amino acid transport increased as well (3). However, above about 1,000 microamps ATP and protein synthesis decreased. When it comes to stimulating healing, more is not better, which is exactly why microcurrent stays so gentle.
Waking up the repair crew (fibroblasts)
Fibroblasts are the cells that build and remodel connective tissue, including scar tissue. When researchers stimulated human skin fibroblasts in the lab, the cells grew faster, migrated better and released more growth factors, the chemical signals that coordinate healing (2). A Japanese study found that very low frequencies (1 to 8 Hz) increased the number of human skin fibroblasts, while a higher frequency (64 Hz) actually reduced them (4). Since fibroblasts are what laid the scar down in the first place, the goal isn't simply "more fibroblasts." It's helping them remodel that tangled collagen into tissue that moves better.
Calming inflammation
Lingering inflammation tends to make scars thicker and more sensitive. In animal and cell studies, microcurrent lowered levels of inflammatory signaling molecules called cytokines (5) and reduced oxidative stress, the cell damage caused by unstable molecules called free radicals, in immune cells called macrophages (6). A 2025 review of the literature suggests that microcurrent supports cellular repair, modulates inflammation and reduces pain, all without discomfort (7)
What does the research on scar tissue show?
In a 2026 pilot study, 17 people with symptomatic surgical scars each received a single 15 to 20 minute microcurrent treatment along the length of the scar. The researchers measured scar depth with high-resolution ultrasound before and after, and found an average reduction of about 24% after just that one session (8).
A 2026 review pulled together 11 clinical studies on microcurrent for wound healing and scars. The overall picture was positive, but the results varied with the different devices, settings and ways of measuring scars. The reviewers concluded that microcurrent may improve scar outcomes and is best used as a complementary therapy (9).
What is a treatment like?
I'll start by asking about your scar: when and how you got it, and what it keeps you from doing. Then I'll check how it moves and feels. Next, I place tiny needles along and around the scar and connect them to the microcurrent device. Most people feel nothing from the current at all, or a gentle buzzing, tingling or spreading sensation. I often combine microcurrent with other techniques in the same session, depending on what your scar and the tissue around it need. Many people notice a change in the appearance of the scar within the first couple of treatments, and within 4-6 treatments the scar is looking, feeling, and moving better. Deeper or older scars may need more treatments while newer scars may start to change right away.
Microcurrent can help with surgical scars from knee, shoulder, hip and ACL surgery, C-sections and abdominal surgery, and for scars from older injuries. If your scar has been feeling a little stubborn or painful, I'd love to take a look. Book online, or send me a message if you have questions.
Hammond A. Ab exercises after a C-section: a phase-by-phase recovery guide. Core Exercise Solutions. Updated 2026. Statistics cited there from Bø et al., 2017 (fascia strength); Lubczyńska, Garncarczyk & Wcisło-Dziadecka, 2023 (adhesion rates); and Olszewska et al., 2024 (scar maturation).
Rouabhia M, Park H, Meng S, Derbali H, Zhang Z. Electrical stimulation promotes wound healing by enhancing dermal fibroblast activity and promoting myofibroblast transdifferentiation. PLoS One. 2013;8(8):e71660. doi:10.1371/journal.pone.0071660
Cheng N, et al. The effects of electric currents on ATP generation, protein synthesis, and membrane transport in rat skin. Clin Orthop Relat Res. 1982;(171):264-271.
Yoshikawa Y, Sugimoto M, Uemura M, et al. Monophasic pulsed microcurrent of 1–8 Hz increases the number of human dermal fibroblasts. Prog Rehabil Med. 2016;1:20160005.
Micro-current stimulation suppresses inflammatory responses in peptidoglycan-treated Raw 264.7 macrophages and Propionibacterium acnes-induced skin inflammation via TLR2/NF-κB signaling pathway. Int J Mol Sci. 2022;23(5):2508. doi:10.3390/ijms23052508
Activation of the pentose phosphate pathway by microcurrent stimulation mediates antioxidant effects in inflammation-stimulated macrophages. Front Physiol. 2025. doi:10.3389/fphys.2025.1666999
Jonik S, Rothka AJ, Cherin N. Investigating the therapeutic efficacy of microcurrent therapy: a narrative review. 2025. doi:10.1177/20406223251361677
Gokal R, et al. Effects of DC microcurrent stimulation on scar remodeling and tissue recovery. J Bodyw Mov Ther. 2026. (news summary)
Review of microcurrent electrical stimulation for tissue healing and scar formation. 2026. doi:10.1177/15347346261469606