Before a mirror check, acne subjects in 2009 had 2.2-fold higher squalene and 59% more sebum than controls. The PMC / Landes Bioscience paper also reported that squalene made up 20% of sebaceous lipids in acne patients versus 15% in controls.
But the pilot sample was small and not adult-only, so the result is best read as a close look at oil chemistry. It is not a population estimate for every adult checking shine before a date, work meeting, or video call.
Squalene rose more sharply than total sebum
The paper said, The specific lipid that differed the most between the two groups was squalene, which was upregulated in acne subjects by 2.2-fold on a quantitative basis. Total sebum was higher by 59%, so the single-marker change was larger than the overall oil change.
Take a 24-year-old who sees forehead shine on a laptop camera and jawline bumps in the mirror. This 2009 paper cannot say her squalene level is 2.2-fold higher. It can say one measured acne group had a bigger squalene shift than its 59% rise in total sebum.
Squalene took 20% of the acne group’s oil blend
Sebum is the oily blend made by pores. In the 2009 paper, squalene represented 20% of sebaceous lipids in acne patients, compared with 15% in controls. The acne group also had 59% more total sebum.
The same source reported that fatty-acid fractions were reduced while triglycerides and wax or cholesterol esters were higher. In plain skin terms, the acne group did not just have more oil. The measured mix of oil fractions also shifted.
What did the 9-person sample leave unanswered?
The authors wrote that Nine males, 15-20 years old, with no acne, or with moderate to severe acne, were recruited. They also wrote that they chose that population to ensure adequate sebum levels and avoid possible menstrual-cycle effects on sebum output.
The paper described the work as A pilot study comparing sebum from unaffected and acne-affected individuals. It used sebum-collecting tapes and lab fractionation to separate lipid groups before analysis. That setup makes the oil chemistry specific, but it also keeps the sample narrow.
That choice limits the question adults often ask in the mirror. The source did not report a mild-to-severe ladder for adults. It compared no acne with moderate-to-severe acne, so it cannot answer whether milder breakouts have a smaller squalene shift.
A 2026 record looked at 66 adult women with oily skin
A 2026 Chem Phys Lipids record on PubMed points to a different adult sample: 66 women aged 18 to 24 with oily skin. It enrolled 33 with healthy oily skin and 33 with mild-to-moderate acne-associated unhealthy oily skin.
That later record described skin surface lipids analyzed by ultra-performance liquid chromatography-quadrupole time-of-flight mass spectrometry, a lab method for identifying lipid patterns. The record gives the 66-person sample, but the lead available here does not give a squalene fold change to compare with 2.2-fold.
Acne and control oil measures side by side
The key values from the 2009 paper separate total oil from the specific squalene marker and its share of all sebaceous lipids.
| Group and measure | Value |
|---|---|
| acne subjects, squalene fold change | 2.2 |
| controls, squalene fold change | 1.0 |
| acne subjects, squalene share | 20% |
| controls, squalene share | 15% |
| acne subjects, total sebum difference | 59% more |
What this means for you
If shine and breakouts are both bothering you, the 2009 study is a reminder not to judge acne by oiliness alone. More oil was part of the acne group’s result, at 59%, but squalene changed more, at 2.2-fold.
For treatment choices, ask a dermatologist or pharmacist how to use options such as benzoyl peroxide, salicylic acid, adapalene, azelaic acid, or prescription medicines. They can help match the choice to your skin, irritation risk, acne type, and whether marks or redness are also present.