Advanced Modalities: Microneedling, Ultrasound, Galvanic, and Related Devices
Microneedling
Collagen induction therapy creates controlled microchannels to stimulate remodeling. Depths range roughly 0.25 to 2.5 mm depending on the area and goal; the face uses shallower depths than stretch marks. Topical anesthetic is often applied and removed before treatment, and only sterile, single-use or properly sterilized needles are acceptable. Contraindications include isotretinoin use, keloid tendency, active acne or infection, anticoagulant therapy, immunosuppression, and pregnancy. Expect pinpoint bleeding and mild erythema, with downtime of a few days.
Ultrasound
Ultrasound at 1 MHz reaches deeper tissue than 3 MHz. Coupling gel is mandatory because sound does not travel through air. Nonthermal settings drive product penetration; thermal settings generate heat. Phonophoresis pushes medication through the skin. Contraindications include pregnancy, pacemakers, cancer, and application over the thyroid, heart, eyes, or bony prominences.
Galvanic and other currents
Desincrustation uses the negative pole to saponify sebum and soften comedones before extraction. Iontophoresis uses the positive pole to drive positively charged ingredients in; cataphoresis is the positive pole, which is acidic and used to calm and close pores; anaphoresis is the negative pole, alkaline, used to soften and stimulate. High frequency uses alternating current for a germicidal, drying effect and is contraindicated with pacemakers, pregnancy, and epilepsy. Microcurrent works at very low amperage to support muscle tone and is contraindicated with pacemakers and recent injectables in the treatment area.
Traps: confusing cataphoresis and anaphoresis; running ultrasound without gel; microneedling over active acne; labeling a roller as reusable without sterilization. Rule of thumb: negative pole softens and cleanses, positive pole delivers and closes.