Under-the-skin pimples form when oil, dead skin cells, and bacteria get trapped deep inside a hair follicle, triggering an inflammatory response well below the surface. If you’re getting more of them than usual, something has shifted in your body’s oil production, your hormone levels, or both. These deep bumps are more stubborn than regular pimples because the clog sits so far down that it can’t drain on its own, and the inflammation spreads into surrounding tissue instead.
What’s Actually Happening Under Your Skin
A normal pimple forms near the surface when a pore gets blocked. Under-the-skin pimples, sometimes called blind pimples, nodules, or cysts, start much deeper in the follicle. Nodules are hard, painful knots that feel firm to the touch and usually don’t develop a visible whitehead. Cysts are similar but softer because they’re filled with more fluid. Some people get both at the same time. They tend to show up along the jawline, chin, cheeks, back, and chest.
What makes these different from a standard breakout is the immune response. When bacteria multiply in a deeply clogged follicle, your body sends inflammatory signals to the area. Certain strains of the bacteria living in your pores are more aggressive than others. They produce enzymes that break down surrounding tissue and trigger your skin cells to release inflammatory compounds. This is why deep pimples hurt, sometimes even before you can see them, and why they can linger for weeks.
Hormones Are the Most Common Driver
Androgens, a group of hormones present in all sexes, directly control how much oil your skin produces. They bind to receptors inside oil glands and essentially turn up production. The more active these hormones are, the more oil your glands pump out, and the more likely your pores are to become deeply clogged. People who are genetically insensitive to androgens produce almost no skin oil at all, which shows just how central this hormone is to the process.
This is why under-the-skin pimples often cluster around specific life stages and events: puberty, menstrual cycles, pregnancy, perimenopause, starting or stopping birth control, and periods of high stress (which raises cortisol and can stimulate androgen activity). If you’ve noticed a pattern tied to your cycle, or if the breakouts concentrate along your jawline and lower face, hormonal fluctuation is very likely the trigger. It’s also why these pimples can seem to appear out of nowhere in your 20s or 30s even if you had clear skin as a teenager.
Diet Plays a Bigger Role Than You Might Think
Two dietary factors have the strongest evidence linking them to deep, inflammatory acne: high-glycemic foods and dairy.
Foods that spike your blood sugar quickly (white bread, sugary drinks, chips, pastries) raise insulin levels, which in turn boost a growth factor called IGF-1. IGF-1 amplifies androgen activity in your skin, increasing oil production. In clinical trials, people who switched to a low-glycemic diet saw significantly greater improvement in inflammatory lesions compared to control groups. One 10-week trial found that participants on a lower-glycemic diet reduced their acne lesion count by about 71% from baseline. People with moderate-to-severe acne consistently show higher daily sugar intake than those without breakouts, and drinking more than 100 grams of sugar from soft drinks per day was associated with a threefold increase in moderate-to-severe acne.
Dairy tells a similar story. Milk consumption of more than three portions per week is associated with a roughly 78% higher likelihood of moderate-to-severe acne. Skim milk shows an even stronger association than full-fat milk, likely because of the whey proteins it contains rather than the fat. Both whey and casein, the two main proteins in milk, raise insulin and IGF-1 levels. If you’ve recently increased your dairy intake, protein shake consumption, or sugar-heavy snacking, that could explain the uptick in deep breakouts.
Why Squeezing Makes Everything Worse
The urge to squeeze a painful bump is understandable, but under-the-skin pimples have no opening at the surface. Pressing on them forces the infected material deeper into the tissue or ruptures the follicle wall sideways, spreading bacteria and inflammation into surrounding skin. This can turn one pimple into a cluster and significantly increases the risk of scarring. Deep lesions like nodules and cysts are the most likely types to leave permanent marks.
Squeezing can also cause lasting pigment changes at the site, sometimes darker or lighter spots that take months to fade. For many people, those marks end up being more visible and longer-lasting than the original pimple would have been.
What You Can Do at Home
Warm compresses are the most effective home approach for under-the-skin pimples. Wet a clean washcloth with warm (not scalding) water and hold it against the bump for five to ten minutes, several times a day. This increases blood flow to the area, helps reduce pain, and can encourage the bump to shrink. Over multiple days, you’ll typically notice the pimple becoming smaller and less tender.
Over-the-counter topicals have limits with deep acne. Benzoyl peroxide can kill bacteria beneath the skin and works better on inflamed, red pimples than salicylic acid, which is more effective for surface-level blackheads and whiteheads. Neither penetrates deeply enough to resolve a true nodule, but benzoyl peroxide can help prevent new ones from forming when used consistently as a wash or leave-on treatment. Topical retinoids, which speed up skin cell turnover and help prevent pores from clogging in the first place, are strongly recommended in current clinical guidelines and are available both over the counter and by prescription.
When Topicals Aren’t Enough
If you’re getting deep pimples repeatedly and topical treatments aren’t controlling them, there are several prescription options that target the problem from the inside.
For women, an anti-androgen medication originally designed as a blood pressure drug works by blocking the hormone signals that drive oil production. It shows similar effectiveness to oral antibiotics for acne and avoids the antibiotic resistance concerns that come with long-term antibiotic use. Combined oral contraceptive pills work through a related mechanism, lowering the androgen activity that fuels breakouts.
For severe or scarring acne that doesn’t respond to other treatments, isotretinoin (sometimes known by its former brand name Accutane) is the only acne medication with long-term disease-modifying potential. It dramatically shrinks oil glands and can produce lasting clearance after a single course. It comes with significant side effects and monitoring requirements, but for persistent, deep acne that keeps coming back, it’s often the treatment that finally breaks the cycle.
For an individual painful nodule that you need resolved quickly, a dermatologist can inject a small amount of steroid directly into the lesion. This rapidly reduces inflammation, often within a day or two. The vast majority of patients (over 99%, based on dermatologist-reported data) have no complications, though there is a small risk of temporary skin thinning or lightening at the injection site that can take three to six months to resolve.
Putting It Together
If you’re suddenly getting more under-the-skin pimples than usual, start by looking at what’s changed. A new hormonal phase (cycle changes, new medication, increased stress), a dietary shift toward more sugar or dairy, or even a new skincare product that’s too heavy for your skin can all tip the balance. Reducing high-glycemic foods and excess dairy is one of the few lifestyle changes with solid clinical evidence behind it for inflammatory acne. Combining that with a consistent topical routine built around benzoyl peroxide and a retinoid covers the main treatable causes: bacteria, clogged pores, and excess oil.
If the breakouts are painful, frequent, or starting to leave marks, that’s a sign the problem is deeper than what surface treatments can reach, and prescription options exist that target the root hormonal and inflammatory drivers rather than just managing individual bumps.