Electrodesiccation passes a high-frequency electrical current from a fine metal tip into a small area of skin. The current does not shock you; it heats the water inside the cells at the point of contact until they dry out and die. "Desiccation" means drying, and that is literally what happens — a few cubic millimetres of tissue are dehydrated and destroyed.
Because the tip is very fine and the current is low, the effect is shallow and precise. That is what makes it suitable for the small stuff: an oil gland that has enlarged into a yellow bump, a cluster of tiny vessels forming a red dot, a milium sitting too deep to lift out with a needle, a skin tag on a narrow stalk. It also seals blood vessels as it goes, which is why it is used to stop bleeding during other procedures and why it is a good option for skin tags in people on blood thinners.
The dead tissue is not removed. It dries into a small dark crust that falls off over one to two weeks, and skin heals underneath.
The limitations follow directly. Nothing is preserved, so nothing can be examined — the diagnosis has to be confident before the tip touches the skin. And because heat kills pigment-producing cells along with everything else, the healed spot can end up lighter than the skin around it.
A hyfrecator is a common brand of the machine used for this, so you may see the procedure called "hyfrecation." It is the same thing.
Very little preparation is needed.
Tell your provider if you have a pacemaker or implanted defibrillator. This is the one thing that genuinely changes the plan.
Eat beforehand.
You do not need to stop blood thinners — this is one of the better procedures for people taking them, because the tip seals as it works.
Mention a lidocaine allergy, a history of keloids, or previous pale marks after a heat- or cold-based treatment.
Come without makeup or creams on the area.
If many small facial lesions are being treated, ask about numbing cream. It needs 30 to 60 minutes on the skin, so it is usually applied at home before you leave.
If you are having sebaceous hyperplasia treated, ask for a test on one or two bumps first rather than all of them at once, particularly on darker skin. This is a normal and reasonable request.
No fasting, no driver, no time off.
This procedure is short. What surprises people is not the pain — it is the noise and the smell.
You sit or lie down. The skin is wiped with antiseptic. A small sticky pad may be placed on your arm or thigh; that is the return electrode and it does nothing except complete the circuit. Because alcohol-based antiseptics are flammable, the area is allowed to dry fully before the device is used.
For most spots, a tiny amount of local anaesthetic is injected beside the lesion. A sharp prick, then a burning sting for about five to fifteen seconds while it spreads. That burn is the lidocaine, which is acidic. For a small skin tag or a cherry angioma, some people choose to skip numbing entirely — the treatment itself is a brief hot sting, and the injection would take about as long.
Numbing cream is an alternative when many facial bumps are being treated, and it needs 30 to 60 minutes on the skin beforehand.
The tip is touched to the lesion. You will hear a small buzz, click or crackle. The bump may visibly shrink, whiten or char slightly as it dries out.
You will smell smoke, and most people describe it as burnt hair. That smell is your own tissue. It is completely normal, it is the detail people most often say nobody warned them about, and it is more noticeable here than in other procedures because the treatment is right under your nose if it is on your face.
If you are numbed, you feel warmth and a light pressure. If you are not, each touch is a brief hot pinprick, roughly like a plucked hair or a snapped elastic band, lasting a second.
Each lesion takes one to five seconds. Twenty small bumps can be done in a few minutes.
A tiny dark crust or a small red mark. Ointment goes on. No stitches, no dressing needed on most sites.
A single cherry angioma is under a minute. A face full of sebaceous hyperplasia is 10 to 20 minutes. The appointment is 15 to 30 minutes.
Yes, straight away. There is no sedation. People go back to work the same hour, though the small crusts are visible if they are on the face, which is worth planning around.
Mild stinging, like a small burn, for a few hours. Redness and slight swelling around each treated spot. Nothing stronger than paracetamol is normally needed.
Apply plain petroleum jelly two or three times a day. Not antibiotic ointment — it does not reduce infection on a clean minor wound and causes an allergic rash in a fair number of people.
Each treated spot forms a small dark crust or scab. On the face these are visible — small dark dots — and this is the phase people find socially awkward rather than painful. Makeup can usually go on after 48 hours, but it is worth asking.
Keep the spots moist with petroleum jelly. Do not pick them. Picking a crust off early is the main reason a procedure that rarely scars leaves a scar.
Shower normally. Avoid soaking, saunas, swimming pools and heavy sweating until the crusts have gone.
The crusts drop off on their own, leaving pink spots underneath.
The pink fades over one to three months. Sunscreen on the treated area every day during this window makes a real difference to the final appearance, particularly on brown and Black skin where the risk is a dark mark.
Most spots settle to skin colour and become hard to find. Some heal slightly paler than the surrounding skin, and some slightly sunken. That is the main lasting trade-off of the procedure and it is more visible on deeper skin tones.
The lesion is destroyed immediately. What you see for the first week or two is a crust, not the result.
Cherry angiomas: usually one treatment clears each one, and they rarely come back at the same site. New ones will keep appearing elsewhere — nothing about the treatment prevents that, and most people who get them keep getting them.
Skin tags: gone permanently once treated. New tags can form in the same areas, particularly where skin rubs.
Deep milia: usually resolved in one go.
Sebaceous hyperplasia: this is where expectations need managing. The visible bump is the top of an enlarged oil gland that extends deeper than the treatment reaches. Recurrence at the same spot is common within months to a couple of years, and people who get them tend to keep producing new ones. It is a maintenance treatment, not a cure, and many people repeat it every one to two years.
Broken capillaries and small vessels: often need a second pass, and new vessels appear over time, especially in rosacea.
The final appearance takes one to three months to settle, as the pink fades. Most treated spots become hard to find. A minority stay as tiny pale or slightly sunken dots, permanently.
The at-home equivalents sold for this are the clearest example on the whole site of a product that copies the idea and loses everything that made it safe.
Battery-powered "plasma pens," skin-tag removers and cauterising wands are widely sold online for exactly these lesions. They burn skin, with no local anaesthetic, no control over depth, no sterility, and nobody diagnosing what is being burnt. The documented results include full-thickness burns, permanent white or brown marks, and craters much worse than the original bump — and on the face, which is where people most want to use them. They are not a weaker version of the clinic device; they are an uncontrolled burn.
The same applies to cutting a growth off, tying it off with thread or dental floss, and caustic pastes.
The reason to avoid all of them is not mainly the scar or the infection, though both happen. It is that some of what people burn off at home is not what they think. A basal cell carcinoma can look almost exactly like sebaceous hyperplasia — a small pearly bump with fine vessels over it. An early melanoma can look like an ordinary mole. Burnt off at home, the tissue is gone, nobody examines it, the surface heals, and what remains keeps growing under the new scar. Said once, plainly: if it is worth removing, it is worth knowing what it was.
What helps at home: for sebaceous hyperplasia, a topical retinoid used consistently can reduce how many new bumps appear, though it will not clear existing ones. For milia, a retinoid and gentle exfoliation reduce recurrence. For everything else here, there is no useful home version — and after treatment, petroleum jelly on the crusts and daily sunscreen on the healing spots are what actually change the outcome.