A high frequency machine sends a mild electrical current through a glass electrode to produce a small amount of ozone on the skin’s surface. This ozone kills bacteria, increases blood flow, and helps skincare products absorb more effectively. Home devices work the same way as professional ones, just at lower intensity. Using one safely comes down to proper preparation, the right technique for your concern, and knowing when to skip a session.
How the Machine Works
Inside each glass electrode is a mixture of noble gases. When the device is turned on and the electrode touches your skin, it emits electromagnetic energy that splits oxygen molecules in the air into single oxygen atoms and ozone. That ozone is what does the heavy lifting: it’s highly reactive, destroying bacteria and fungi on contact by oxidizing them so they can no longer reproduce. At the same time, the gentle current stimulates blood circulation in the treated area, bringing more oxygen and nutrients to the skin.
You’ll notice electrodes come in two colors. Orange or red electrodes contain neon gas, while violet or blue electrodes contain argon gas. The traditional advice was to use violet for acne and orange for aging skin, but recent evidence shows both gases are effective regardless of the concern. Choose whichever came with your device and don’t worry about swapping.
Preparing Your Skin
Start by cleansing your face thoroughly to remove makeup, oil, and debris. The electrode needs to glide smoothly, and any residue on the skin will interfere with contact. Pat your skin dry.
Next, apply a thin layer of lightweight serum or a hydrating product. Many people then place a single layer of gauze over the treatment area. The gauze serves two purposes: it helps the electrode move without dragging, and it prevents the mild sparking sensation that some people find uncomfortable on bare skin. If you’re treating a specific blemish with the sparking method (more on that below), you’ll skip the gauze for that spot.
Step-by-Step Application
Place your finger on the electrode before turning the device on. This prevents an unexpected zap when the glass first contacts your skin. Start at the lowest intensity setting, especially during your first few sessions. You should feel a gentle warming or tingling, not pain.
For general facial treatment, use smooth, circular or sweeping motions across the skin. Keep the electrode in constant contact and move it steadily. Don’t let it sit in one spot for more than a few seconds. Work across the forehead, down the cheeks, along the jawline, and gently around the nose. Avoid the eye area entirely, and keep the electrode away from any metal jewelry or piercings.
When you’re finished with an area, place your finger back on the electrode before lifting it off the skin, then turn the device off. This prevents the small spark that happens when contact breaks suddenly.
Spot Treating Blemishes
For individual pimples, you can use a technique called sparking. Hold the electrode just slightly above the skin’s surface so a small visible spark jumps to the blemish. This concentrates the ozone directly on the bacteria inside the pore. Keep it brief, just a few seconds per spot. The sensation is a tiny zap, noticeable but not painful at low settings. This method works well on active breakouts but should not be used on open wounds, popped pimples, or irritated skin.
Using the Comb Attachment on Your Scalp
Most home kits include a comb-shaped electrode designed for the scalp. It works the same way as the facial electrodes but is shaped to part through hair and make contact with the skin underneath. The comb emits infrared energy directly to the scalp, improving blood circulation to hair follicles and helping with nutrient delivery.
Run the comb slowly across your scalp in sections for about two to three minutes per session. The increased circulation can help reduce dandruff, calm an itchy scalp, and over time may support stronger hair growth by stimulating the follicles. For noticeable results, aim for at least 10 consecutive sessions spaced two to three times per week. After that, you can shift to a maintenance schedule of roughly once every two weeks.
How Often and How Long
There’s no single rule that works for everyone, since the right frequency depends on your skin type and what you’re trying to address. That said, most home users do well with sessions of 5 to 15 minutes on the face, two to three times per week. For oily or acne-prone skin, shorter and more frequent sessions at the lower end of that range let you monitor how your skin reacts. For general skin rejuvenation, slightly longer sessions less often may be enough.
The key principle is to start low and build gradually. Use the lowest intensity setting for your first several sessions. Give your skin at least a day of rest between uses. If you notice redness, dryness, or irritation after a session, extend the gap between treatments or reduce the time. Your skin should look slightly flushed immediately afterward, similar to a brisk walk in cold air, but that should fade within 30 minutes or so.
Aftercare
After your session, apply a lightweight, non-comedogenic moisturizer. Your skin will be slightly more receptive to products immediately after treatment, so this is a good time for hydrating serums. Avoid heavy or pore-clogging formulas. Skip any harsh active ingredients like strong retinols or chemical exfoliants for the rest of the day, since the treatment has already stimulated the skin and you don’t want to compound the irritation.
If you treated your skin during the daytime, apply sunscreen before heading outside. The mild stimulation can leave skin temporarily more sensitive to UV exposure.
Who Should Not Use One
High frequency machines are safe for most people when used correctly, but there are several important exceptions. Do not use the device if you have a pacemaker or any implanted electronic device, metal plates, or pins in the treatment area. The electrical current can interfere with these.
You should also avoid it if you are pregnant or breastfeeding, have epilepsy, a bleeding disorder, or a heart condition. People with active skin infections, cold sores, open wounds, sunburn, or rashes need to wait until those have fully healed. If you’re taking isotretinoin (commonly known by the brand name Accutane), wait at least 12 months after finishing your course before using a high frequency device, as the medication makes skin extremely fragile.
Other conditions that call for caution include rosacea, broken capillaries, severe acne (grades 3 or 4 with deep cysts), eczema, psoriasis, autoimmune disorders, and advanced diabetes that affects wound healing. If you have any loss of sensation in the skin, you won’t be able to gauge whether the device is too intense, which makes burns more likely. When in doubt about a specific condition, check with a dermatologist before your first session.
Common Mistakes to Avoid
The most frequent error is leaving the electrode in one place too long. Constant motion is essential. Holding the glass still on one spot concentrates heat and ozone, which can cause irritation or small burns. Another common mistake is starting at a high intensity because the low setting “doesn’t feel like it’s doing anything.” The ozone production happens at every setting. You don’t need to feel a strong buzz for the device to work.
Using the device on wet skin or with water-based products that haven’t absorbed can intensify the current uncomfortably. Make sure products have soaked in and any excess is blotted away. Finally, always clean the glass electrodes with alcohol before and after each use. They touch your skin directly, and bacteria on a dirty electrode defeats the entire purpose.