Acne is a skin condition. Not a character flaw.
Acne forms when hair follicles become clogged with oil (called sebum), dead skin cells, and sometimes bacteria. Hormonal changes, genetics, and your skin's natural oil production all play a role. It's rarely about how often you wash your face.
Why it happens
Your skin naturally produces oil through glands connected to hair follicles. When oil and dead skin cells block a pore, the result depends on how deep the blockage is and how your immune system responds. Bacteria already present on your skin (particularly Cutibacterium acnes) can amplify inflammation once a pore is clogged, but acne isn't caused by being dirty.
Common lesion types
Not all acne looks or behaves the same. Different lesion types reflect different stages of the same underlying process, and they may respond to different treatments. Knowing what you're dealing with is a useful first step.
Whiteheads
Clogged pores that remain closed at the surface. Appear as small, white or skin-colored bumps.
Blackheads
Clogged pores that are open to the air. The dark color comes from oxidation, not dirt.
Papules
Small, raised, inflamed bumps without visible pus. Often tender to the touch.
Pustules
Inflamed bumps with visible white or yellow pus at the tip. The classic "pimple."
Nodules
Large, hard, painful lumps that sit deep under the skin. They don't come to a head and can persist for weeks.
Cysts
Deep, pus-filled lesions that are often painful and may cause scarring if untreated. Typically the most severe type.
The acne severity scale
Dermatologists use a standardized grading system to describe how mild or severe acne is. Understanding where your acne falls helps set realistic expectations for treatment timelines and which options are most appropriate.
Mostly non-inflammatory
Primarily blackheads and whiteheads, with few or no inflamed lesions. OTC treatments are often effective with consistent use.
Mix of non-inflammatory and inflammatory
A combination of comedones with papules and some pustules. OTC products may help, but professional guidance often leads to better and faster results.
Predominantly inflammatory
Many papules and pustules, often across larger areas. Prescription treatment is typically needed, and the risk of scarring increases.
Nodulo-cystic acne
Deep, painful nodules and cysts, often widespread. Most likely to cause permanent scarring and typically treated with stronger prescription options.
Hormonal acne
For many people, particularly women and people assigned female at birth, acne is closely tied to hormonal fluctuations rather than just pore-clogging. This distinction matters because the treatment approach can be quite different.
Androgens (hormones like testosterone) stimulate the skin's oil glands. When androgen levels rise or fluctuate — during puberty, the menstrual cycle, pregnancy, or with conditions like PCOS — the result is often increased oil production and more frequent breakouts.
Marks left behind: PIH and PIE
Once an active pimple heals, it can leave behind a flat discoloration that may take weeks or months to fade. These marks are not scars — they don't involve changes to skin texture. For people with medium to deep skin tones, these marks are often more pronounced and longer-lasting.
Dark brown or grayish marks
Caused by excess melanin production triggered by inflammation. More common and more persistent in people with medium to deep skin tones. Can deepen with sun exposure.
Pink, red, or purple marks
Caused by damaged blood vessels left behind after inflammation. More visible in people with lighter skin tones. Often fades faster than PIH but can persist for months.
Common myths, cleared up
A lot of what circulates about acne is either overstated or outright wrong. These four myths can actually get in the way of finding something that helps.