Does oil cleansing actually remove blackheads?

Sebum dissolves in oil. So yes, oil and balm cleansers lift the day's sebum, sunscreen and oil-based makeup more gently than foam alone. Water leaves more than half the sunscreen behind, and with a water-resistant formula a foam cleanser still leaves about a third where an oil cleanser leaves almost none — though with ordinary sunscreen the two finish about the same (Chen et al., 2020). But a blackhead isn't dirt. It's sebum and keratin lodged in the pore, so oil doesn't melt it out. That cleared, smooth feeling is mostly surface sebum and sebaceous filaments leaving for a while — and the pore fills again.

"Oil dissolves oil" is a line you hear in every cleansing ad. Half of it is true. Knowing where that half ends saves you from your fifth jar of balm.

"Oil dissolves oil" — how far it holds

Sebum, sunscreen and most makeup are oil-soluble, so an oil-based cleanser loosens them well. In one study of 20 people, rinsing with water left more than half the sunscreen behind. What the cleanser was worth depended on the sunscreen. With an ordinary formula, foam and oil finished about the same — 15.6% left against 13.4%. With a water-resistant formula the gap opened: foam left 36.8%, the oil 5.8%. Dry skin after washing was reported by eight of the twenty for the foam cleanser and by one for the oil (Chen et al., 2020). The case for an oil first cleanse is water-resistant sunscreen and oil-based makeup, not sunscreen in general.

Does oil cleansing remove blackheads?

Here's the other half. A blackhead is an open comedo: sebum and dead skin plugged in the pore. The dark tip is the plug's own color, not grime — though what produces that color is unsettled. A study of expressed comedones found the predominant pigment to be melanin (Blair & Lewis, 1970); an electron microscopy study thirteen years later found no melanosomes at all (Zelickson & Mottaz, 1983). The familiar "your sebum oxidized" line is hard to trace to any study that reported it. Whichever it is, no amount of surface oil melts the plug out whole. Why they keep coming back is covered in large pores and blackheads. Oil cleansing clears the day's oil. It doesn't dissolve blackheads away.

Why does skin feel smoother after an oil cleanse?

Your nose does feel smoother after an oil cleanse, and the feeling is real. But it's mostly surface sebum and sebaceous filaments leaving for a while. Sebaceous filaments are the tiny dots along the nose where the pore channels oil to the surface. They're normal, not a flaw, and they refill within about a month whether you squeeze or wash them out. Smooth is a pore briefly emptied, not a pore erased.

Does over-cleansing make skin oilier?

The trouble starts when you chase that smoothness. Hot water, oil cleansing twice a day, long massaging, squeezing, pore strips. Push hard enough and the barrier thins, and skin makes more oil to make up for feeling stripped. Bare on top, oilier underneath. Why over-washing raises oil is covered in why oily skin is often dehydrated. Paring back and digging out are not the same wash.

So: pare back, don't dig

Oil and balm cleansers make a good first cleanse. They dissolve the day's sebum and sunscreen gently, with less strain on the barrier than a strong foam. That is what oil does well. For the blackheads underneath, skip the squeezing and strips, and let a mild BHA (salicylic acid), used low and occasionally, empty the pore slowly. How many steps you actually need is in how many steps a skincare routine needs. Your skin already knows how to move its own oil. The kind thing is to pare back without getting in its way.

One small step

• On days you wore water-resistant sunscreen or oil-based makeup, dissolve it first with oil or balm, then finish with a gentle foam.
• In the morning, or on a bare-skin day, one cleanse is enough.
• Keep oil cleansing to once a day, with lukewarm water. Skip hot water and long massaging.
• Don't squeeze blackheads or use pore strips. Let a mild BHA empty them slowly.