Electricity and Facial Machines

Why Electricity Is on the Exam

Facial machines run on electricity, and the Texas Department of Licensing and Regulation (TDLR) tests whether you can use them safely. Misusing current can burn a client, trigger a seizure, or interfere with a pacemaker. Expect several scenario questions on contraindications and machine setup.

First, two definitions you must know.

• Direct current (DC): a constant, even-flowing current traveling in one direction. Galvanic machines use DC.
• Alternating current (AC): a rapid, interrupted current that reverses direction. High-frequency (Tesla) machines use AC.

A rectifier converts AC from the wall outlet into DC. A converter changes DC to AC. Knowing which machine uses which current is a classic test trap.

Galvanic Current

Galvanic current is a constant DC used for two chemical effects based on polarity.

• Desincrustation: the negative pole (cathode) creates an alkaline reaction that softens and emulsifies sebum and debris, loosening clogged pores before extractions. Use it on oily, congested skin.
• Iontophoresis: uses galvanic current to drive water-soluble (ionic) products into the skin. Anaphoresis pushes negatively charged solutions in from the negative pole; cataphoresis pushes positive solutions in from the positive pole and soothes/tightens after desincrustation.

Remember the polarity rule: like poles repel. A negative product is driven in by the negative electrode.

Galvanic safety

Do not use galvanic current on a client who is pregnant, has a pacemaker or heart condition, epilepsy, metal implants, braces, or open/inflamed skin. The client must hold the inactive electrode for the circuit to complete.

High-Frequency (Tesla) Current

High-frequency current, also called Tesla current or violet ray, is a high-rate AC delivered through a glass electrode. It produces heat and a small amount of ozone, giving it germicidal, drying, and stimulating effects. It is used after extractions on acne-prone skin to help disinfect and calm the area.

There are two application methods:

High-frequency safety

The single most-tested rule: the client must remove all metal jewelry from the treatment area before high-frequency, because metal conducts the spark and can cause a burn or shock. Never use it on clients with a pacemaker, epilepsy, high blood pressure, or pregnancy. Never let the electrode lose and re-make contact with bare skin while powered — lift it only after reducing intensity.

Microcurrent and Other Devices

Microcurrent is an extremely low level of electrical current that mirrors the body's natural bioelectricity. It is marketed for facial toning — re-educating facial muscles and boosting ATP (adenosine triphosphate), the cell's energy molecule. It is sub-sensory (the client should feel little to nothing). Contraindications mirror the others: pacemakers, pregnancy, epilepsy, metal implants, and active cancer.

Steamers use heat to soften skin and stimulate circulation, not electrical stimulation, but the unit is still electrical equipment — keep the water reservoir clean and never let it run dry. Use only distilled water to prevent mineral buildup and spitting.

Worked example: choosing a modality

A client has oily, congested skin and wants a clarifying facial. Sequence: cleanse, desincrustation (galvanic, negative pole) to soften sebum, extractions with gloved hands, then high-frequency (direct method over gauze) to disinfect and calm. Finish with cataphoresis (galvanic, positive pole) to tighten and soothe. Each device is wiped/disinfected before the next client. This single facial touches three of the four modalities and is a favorite exam scenario.

Electrical Safety Vocabulary

Keep these straight for the safety questions:

• Volt (V): the pressure that pushes current through a wire.
• Amp (A): the strength/quantity of the current. A milliampere (mA) is 1/1000 of an amp — facial machines are rated in mA because they use tiny currents.
• Ohm: a unit of resistance to current flow.
• Watt (W): how much electrical energy is used per second.
• Fuse / circuit breaker: safety devices that cut the circuit during an overload.
• GFCI (ground-fault circuit interrupter): an outlet that shuts off instantly if it detects current leaking, preventing shock. Required near water/sinks.

Common exam traps

• Confusing galvanic (DC) with high-frequency (AC).
• Forgetting that desincrustation uses the negative pole and is for oily skin.
• Touching a powered high-frequency electrode to skin without gauze, or leaving metal jewelry on.
• Overloading an outlet by plugging multiple high-wattage devices into one circuit.

TDLR Scope and Equipment Rules

Under 16 TAC 83.112(c), any product, preparation, or procedure that contacts or penetrates the dermis is prohibited for Texas estheticians — you work on the epidermis only. That is why laser hair removal and dermis-penetrating devices fall outside your license and require a physician.

Under 16 TAC 83.102(e), electrical equipment that cannot be immersed in liquid must be wiped clean and disinfected before each use on a client with an EPA-registered disinfectant. Glass high-frequency electrodes are removed, cleaned, and disinfected per the manufacturer between clients. Always inspect cords for fraying and never operate a machine with wet hands.

Setup and shutdown habits that prevent shock

Good machine discipline is testable behavior. Before a service: confirm the dial is at zero before powering on, connect the inactive electrode, and place a damp sponge/gauze barrier where the manufacturer requires one. During a service: increase intensity gradually and never exceed the client's comfort. After a service: return the dial to zero before disconnecting, unplug by gripping the plug (never the cord), and wipe down the unit. Keep all cords off the floor and away from water. A GFCI-protected outlet near the facial sink is your last line of defense if a fault occurs.

Quick reference: which current does what

Memorize this grid; the exam often asks you to pick the one machine that does NOT use the same current type as the others, and the right answer pivots on galvanic (DC) versus high-frequency (AC).