Acne Cut

Acne Basics

Acne or something else? Six bumpy skin conditions compared

Drafted with AI assistance · not reviewed by a dermatologist · Published August 2, 2026 · Last updated October 5, 2026

Short answer

Acne is marked by plugged follicles, the blackheads and whiteheads, alongside inflamed spots [1]. Rosacea, folliculitis, keratosis pilaris, milia and perioral dermatitis can look similar [2][4][5][6][7], and some are treated differently, so a doctor's view is worth having if you are not sure [2][8].

How settled

Well established

What we read

  1. National Institute of Arthritis and Musculoskeletal and Skin Diseases, Acne: overview, symptoms and causes
  2. NHS, Rosacea
  3. MedlinePlus, Rosacea
  4. MedlinePlus, Folliculitis
  5. NHS, Keratosis pilaris
  6. Gallardo Avila PP, StatPearls 2023
  7. Tolaymat L, StatPearls 2025
  8. NHS, Acne
A folded towel, a small jar and a small amber bottle on a tiled counter
A towel, a jar and a small amber bottle. AI-generated illustration.

What makes acne acne

Folded towels and a clear dropper bottle on a saucer against white tiles
Towels and a clear dropper bottle. AI-generated illustration.

Acne starts in the hair follicle. Oil and dead skin cells stick together and plug the pore; doctors call these plugged follicles comedones, and they show up as whiteheads when they stay closed and blackheads when they open at the surface [1].

Bacteria that normally live on the skin can then grow in the plug and cause inflammation, which produces the red bumps, pus-filled spots and deeper lumps [1]. So acne usually shows a mix: some plugged pores and some inflamed spots, most often on the face, but also on the back, chest and shoulders [1].

Diagram of the five kinds of acne spot in cross-section: whitehead, blackhead, papule, pustule, and nodule or cyst.
Acne's own spots, in cross-section. Diagram drawn for Acne Cut from the descriptions in source 1.

The conditions most often mistaken for it

Several other conditions also produce bumps on the face or body. The NHS lists acne, several kinds of dermatitis, lupus and keratosis pilaris among the conditions rosacea can be confused with [2]. The table below sets out the main differences.

ConditionWhere it usually showsWhat it looks likeClues that point to it
AcneFace, back, chest, shoulders[1]Blackheads, whiteheads, red bumps, pus-filled spots, deeper lumps[1]Plugged follicles (blackheads and whiteheads) alongside the inflamed spots[1]
RosaceaNose, cheeks, forehead, chin[2]Redness and flushing; small pink or red bumps, some with yellowish fluid[2]Redness that comes and goes, burning or stinging, tiny visible blood vessels, triggers such as hot drinks or alcohol[2][3]
FolliculitisAnywhere with hair, often neck, groin, beard area[4]Itchy pimples or pustules around hair follicles that may crust[4]Started after shaving or rubbing clothing; usually an infection of the follicle[4]
Keratosis pilarisArms, thighs, buttocks[5]Small, rough, painless bumps, often skin-colored[5]Dry, rough patches, often better in summer and worse in winter[5]
MiliaMostly the face[6]Small, firm, white bumps[6]Tiny cysts of keratin under the skin rather than plugged, inflamed follicles[6]
Perioral dermatitisAround the mouth, sometimes nose and eyes[7]Small inflamed bumps and pustules, or pink scaly patches[7]Often linked to steroid creams used on the face[7]

Rosacea

Rosacea is a long-term condition that mainly affects the face. It usually begins with redness or blushing across the nose, cheeks, forehead and chin that comes and goes, often with a burning or stinging feeling, and later the redness can become constant [2]. Small pink or red bumps can appear, which is why it is easily taken for acne [2][3].

Clues that point to rosacea are the flushing, tiny blood vessels that do not go away, and symptoms that flare with triggers such as alcohol, spicy food, hot drinks, sunlight and exercise [2]. It is most common between the ages of 30 and 50 and in women, though symptoms tend to be worse in men [3].

Folliculitis

Folliculitis is inflammation of one or more hair follicles, usually after the follicle has been damaged or blocked, for example by shaving or by clothing rubbing the skin. Most often the damaged follicles become infected with staph bacteria [4]. It causes itchy pimples or pustules around hairs, commonly on the neck, groin or beard area, and the spots may crust [4].

A related problem, pseudofolliculitis barbae, happens when curly beard hairs are cut very short and curve back into the skin [4]. Because folliculitis is usually an infection, it may be treated with antibiotics or, when a fungus is the cause, with antifungal medicine [4].

Keratosis pilaris

Keratosis pilaris is a very common and harmless condition that causes small, painless bumps, usually on the arms, thighs or buttocks. The skin feels dry and rough, the bumps are often skin-colored, and it is often better in summer and worse in winter [5].

It tends to last for years and may clear up on its own. The NHS suggests moisturizing, mild unperfumed products and gentle washing, and warns that harsh scrubs can make it worse [5].

Milia

Milia are small, firm, white bumps, most often on the face. They are tiny cysts of keratin, a skin protein, sitting just under the surface, rather than blocked and inflamed follicles [6]. Many babies are born with them; others appear after skin damage, with some medicines, or alongside other skin conditions [6].

Perioral dermatitis

Perioral dermatitis causes small inflamed bumps and pustules, or pink scaly patches, around the mouth, and sometimes around the nose and eyes. It is most common in young women [7].

It is strongly linked with steroid creams used on the face: the rash first improves with the steroid, then often gets worse when it is stopped. Other suggested triggers include steroid inhalers and nasal sprays, cosmetics, sunscreens and face masks [7]. This is one of the clearest reasons not to treat an unexplained facial rash with a steroid cream on your own.

Why the difference matters

Getting the name right changes the treatment. Folliculitis is often an infection [4], perioral dermatitis can be made worse by the steroid creams that might be used on other rashes [7], and keratosis pilaris is usually harmless and managed with simple skin care [5].

If you are not sure what you have, the NHS advises seeing a doctor about symptoms of rosacea, and about acne that is not improving, is deep or painful, is scarring, or looks infected [2][8]. Rosacea and folliculitis, for example, are usually diagnosed simply by looking at the skin and asking about symptoms [3][4].

The four evidence labels used on Acne Cut, with “Well established” highlighted for this article.
This article's label: Well established. The labels describe the research, not how likely something is to work for you.

Sources

  1. National Institute of Arthritis and Musculoskeletal and Skin Diseases. Acne: overview, symptoms and causes. NIH, last reviewed July 2023; accessed October 5, 2026. Read it
  2. NHS. Rosacea. Accessed October 5, 2026. Read it
  3. MedlinePlus. Rosacea. US National Library of Medicine; accessed October 5, 2026. Read it
  4. MedlinePlus. Folliculitis. US National Library of Medicine; accessed October 5, 2026. Read it
  5. NHS. Keratosis pilaris. Accessed October 5, 2026. Read it
  6. Gallardo Avila PP, Mendez MD. Milia. StatPearls. Treasure Island (FL): StatPearls Publishing; 2023. PubMed 32809316
  7. Tolaymat L, Syed HA, Hall MR. Perioral dermatitis. StatPearls. Treasure Island (FL): StatPearls Publishing; 2025. PubMed 30247843
  8. NHS. Acne. Page last reviewed September 22, 2026; accessed October 5, 2026. Read it

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