Skin pores are typically between 0.1 and 2 millimeters deep, depending on where they are on your body and how active the oil gland attached to them is. That’s deeper than most people expect. A pore isn’t just a tiny hole on the surface of your skin. It’s a canal that extends down through the outer skin layer (the epidermis) and into the thicker layer beneath it (the dermis), where it connects to an oil gland and, in most cases, a hair follicle.
What a Pore Actually Looks Like Inside
Think of a pore as a narrow funnel. The opening you see on the surface of your skin is the widest point, usually between 50 and 100 micrometers across on the face. From there, the canal narrows as it travels downward through the epidermis, which is only about 0.1 millimeters thick on the face. But the pore doesn’t stop at the bottom of the epidermis. It continues into the dermis, where the oil-producing sebaceous gland is anchored.
Sebaceous glands sit in the reticular dermis, the lower, thicker portion of the dermis made of dense collagen fibers. This layer provides structural support for hair follicles, sweat glands, and sebaceous glands. On the face, the dermis extends roughly 1 to 2 millimeters below the skin’s surface, and the base of a large facial pore can reach nearly that deep. On the nose and forehead, where oil glands are biggest and most concentrated, pores tend to be both wider and deeper than on the cheeks.
Why Pore Depth Varies by Location
Not every pore on your body is the same depth. The key factor is the size of the sebaceous gland feeding into it. On your nose, forehead, and central face (the T-zone), sebaceous glands are large and highly active, creating deeper, more visible pores. On areas like your forearms or shins, the glands are small, and the pores are shallow enough to be nearly invisible.
Your palms and the soles of your feet have no sebaceous glands at all, which is why those areas have no visible pores in the traditional sense. They do have sweat gland openings, but those are a different structure entirely, much smaller and shallower.
How Pore Size Changes With Age
Pore openings tend to become more visible over time, with the most noticeable jump happening between your 30s and 40s. Research published in Skin Research and Technology found that the number of visibly enlarged pores increases significantly during that decade, particularly on the nose and forehead. Interestingly, there was no significant difference between men and women in terms of enlarged pore counts.
What’s actually happening isn’t that pores are growing deeper with age. Instead, the skin around them loses collagen and elasticity, which makes the opening appear larger and more pronounced. Sun damage accelerates this process. Years of oil production can also stretch the canal walls slightly, but the fundamental depth of the pore, set by where the sebaceous gland sits in the dermis, stays relatively constant throughout your life.
How Deep Clogs Form Inside a Pore
When a pore gets clogged, the blockage can sit at different depths along the canal. Blackheads form when a plug of oil and dead skin cells sits right at the surface, exposed to air, which oxidizes it and turns it dark. Whiteheads form when the plug sits just below the surface, covered by a thin layer of skin.
Sebaceous filaments are a different story. These are thin, thread-like collections of oil that line the inside of the pore canal from the sebaceous gland all the way up to the surface. They’re a normal part of how your skin moves oil to the surface, and they fill much of the pore’s depth. On the nose, where pores are deepest and most active, sebaceous filaments are often visible as tiny grey or yellowish dots. Extracting them is temporary because the gland keeps producing oil to refill the canal.
Deeper blockages cause more serious problems. When a clog forms further down in the pore canal and bacteria get trapped beneath it, the resulting inflammation happens in the dermis, which is why deep cystic acne produces painful, swollen bumps rather than surface-level blemishes. The deeper the clog, the more tissue is involved in the inflammatory response.
How Deep Skincare Products Can Reach
Most topical skincare products don’t penetrate very far into a pore. The outermost layer of skin, the stratum corneum, is a barrier designed to keep things out. It’s only about 10 to 20 micrometers thick, but it’s remarkably effective at blocking absorption. Many moisturizers and serums work primarily at this surface level.
Oil-soluble ingredients have an advantage because the pore canal is lined with sebum, which is itself oily. Salicylic acid, for example, is oil-soluble, which allows it to dissolve into the sebum inside the pore and work deeper along the canal than water-soluble ingredients can. This is why it’s commonly used for blackheads and clogged pores. Retinoids also penetrate relatively well because of their lipid-soluble structure.
Some skincare companies use encapsulation technology, packaging active ingredients in particles as small as 70 to 150 nanometers, to push ingredients deeper into the skin. For context, that’s roughly 1,000 times smaller than the width of a pore opening. Whether these technologies deliver ingredients all the way to the base of a deep facial pore remains a matter of ongoing debate, but they do appear to improve penetration past the surface barrier compared to standard formulations.
Can You Change How Deep Your Pores Are?
You can’t change the depth of your pores. The sebaceous gland’s position in the dermis is determined by your genetics and doesn’t shift based on skincare routines, temperature, or any topical product. The common idea that cold water “closes” pores or steam “opens” them is misleading. Pores aren’t muscles. They don’t open and close. Cold can cause slight temporary contraction of the surrounding skin, and steam can soften the oil inside the canal, but neither changes the structure of the pore itself.
What you can influence is how visible the pore opening appears. Keeping pores clear of excess oil and dead skin cells prevents them from stretching wider at the surface. Retinoids increase skin cell turnover, which helps prevent the buildup that makes pores look larger. And protecting your skin from UV damage preserves the collagen around pore openings, slowing the age-related enlargement that becomes noticeable in your 40s and beyond.