Skin Health - 8 min read
Understand how closed comedones, milia, sebaceous filaments and irritation differ, and why a flat acne mark is not the same as a structural scar.
Small bumps on the forehead, black dots around the nose, occasional pimples and dark marks left behind after acne are common skin concerns.
Some people notice that these problems continue despite regular cleansing and skincare. Others experience dryness, irritation or new bumps after introducing different products.
Understanding these changes begins with recognising that similar-looking skin concerns do not always have the same cause.
Acne, clogged pores, irritation and pigmentation can occur separately or together. The appropriate approach depends on identifying the underlying condition.
Small, skin-coloured bumps may be caused by closed comedones, commonly called whiteheads.
Closed comedones develop when excess oil and dead skin cells accumulate within a hair follicle, blocking its opening.
They often appear as small, raised bumps without the redness or swelling associated with inflammatory acne.
However, not every small facial bump is a closed comedone.
Other possible causes include:
Distinguishing these conditions is important because their management can differ.
The 2024 acne-management guidelines published in the Journal of the American Academy of Dermatology recognise that different forms of acne may require different treatment approaches.
These guidelines support several established treatments, including topical retinoids, benzoyl peroxide and, with more conditional evidence, salicylic acid and azelaic acid.
The selection of treatment depends on the type and severity of acne, individual circumstances and the potential for side effects.
The key point: A product that helps ordinary acne may not be appropriate for every type of facial bump.
Research reference: Reynolds et al., 2024 [1].
Blackheads, also called open comedones, form when oil and dead skin cells collect inside a hair follicle with an open surface.
The material near the surface becomes dark through oxidation. Blackheads are not simply dirt trapped inside the skin.
However, some small dark dots on the nose are not blackheads at all.
They may be sebaceous filaments.
Sebaceous filaments are normal structures associated with oil-producing glands. They help move sebum, the skin's natural oil, towards the surface.
They can become more noticeable when the skin produces more oil.
Unlike blackheads, sebaceous filaments are not a form of acne.
Repeated squeezing or aggressive extraction may irritate the surrounding skin without providing a lasting improvement in their appearance.
A gentle skincare routine can help maintain skin health, but completely removing normal sebaceous filaments is neither necessary nor realistic.
Oily skin and dry or uncomfortable skin are not necessarily opposites.
Some people notice an oily forehead or nose while also experiencing tightness, roughness or flaking in other areas.
Several factors may contribute to these symptoms, including harsh cleansing, environmental conditions and irritation from skincare products.
The outermost layer of the skin plays an important role in limiting water loss and protecting against external irritants. This function is commonly described as the skin barrier.
A 2024 cross-sectional study published in Clinical, Cosmetic and Investigational Dermatology compared skin-barrier measurements in 164 participants with acne and 152 participants without acne.
The researchers observed higher transepidermal water loss, higher sebum production and higher measured skin hydration in the acne group.
These findings suggest that acne can be associated with differences in skin-barrier function. However, the study does not establish that everyone with acne has dehydrated skin, nor does it prove that acne itself caused the observed differences.
The findings highlight the importance of considering skin comfort and barrier function when managing acne.
Research reference: Sukanjanapong et al., 2024 [2].
Gentle cleansing and appropriate moisturizing may help reduce dryness and irritation, including during acne treatment.
Introducing a new cleanser, moisturizer, sunscreen or serum may sometimes coincide with changes in the skin.
These changes can have different explanations.
Certain ingredients or formulations may cause irritation in some individuals. Existing acne may also continue developing independently of a recently introduced product.
When several products are introduced together, identifying a possible trigger becomes more difficult.
Signs of irritation can include:
Acne treatments containing active ingredients can also cause dryness or irritation, particularly when used more frequently than directed.
Using multiple exfoliating products does not necessarily improve results and may make sensitive skin more uncomfortable.
If a product causes persistent irritation, discontinue it and seek medical advice if symptoms do not settle.
A pimple may disappear while leaving a flat area of darker skin.
One possible cause is post-inflammatory hyperpigmentation (PIH).
PIH occurs when inflammation or injury triggers increased pigmentation in the affected area.
It can develop after acne and may be particularly noticeable in people with medium to darker skin tones.
These marks may take weeks or months to fade, sometimes longer.
It is also important to distinguish pigmentation from acne scars.
These conditions may require different management approaches.
A 2024 systematic review published in the Journal of Cutaneous Medicine and Surgery examined 48 studies involving 1,356 individuals with skin of colour.
The review found that post-inflammatory hyperpigmentation can be persistent and that available treatments have varying levels of supporting evidence.
The researchers highlighted limitations in the strength and consistency of treatment evidence.
This means that improvement may differ between individuals, and no single approach can be assumed to work equally well for everyone.
Research reference: Mar et al., 2024 [3].
Managing active acne and protecting the skin from excessive sun exposure are important considerations when addressing acne-related pigmentation.
Not necessarily.
While acne can leave dark spots, other pigmentation conditions can also affect the face.
One example is melasma, which often appears as brown or grey-brown patches on the cheeks, forehead, nose or upper lip.
Melasma may be influenced by sun exposure, hormonal factors and other individual triggers.
Unlike acne-related pigmentation, melasma does not require a preceding pimple.
Different pigmentation conditions can look similar, especially in their early stages.
Because treatment depends on the cause, identifying the type of pigmentation is an important part of appropriate care.
Simple skincare habits can support skin health, although they may not resolve every skin condition.
Use a gentle cleanser.
Avoid aggressive scrubbing and frequent washing that leaves the skin feeling excessively tight or irritated.
Choose a suitable moisturizer.
Moisturizers can help maintain skin comfort and reduce dryness. For acne-prone skin, products labelled non-comedogenic may be useful.
Protect the skin from sunlight.
Broad-spectrum sunscreen with SPF 30 or higher, alongside shade and protective clothing, helps protect against ultraviolet exposure and may reduce worsening of certain pigmentation concerns.
Avoid picking or squeezing blemishes.
Picking can increase inflammation and the likelihood of persistent marks or scars.
Introduce new products carefully.
Avoid adding several active skincare products at the same time. Follow product instructions and stop using a product that causes significant irritation.
Allow appropriate treatments time to work.
Many acne treatments require several weeks before noticeable improvement occurs. Depending on the condition, the treatment plan and individual response, results may take longer.
Certain medications and active ingredients are unsuitable during pregnancy or when planning pregnancy. Medical advice is important before starting acne medication in these circumstances.
Many mild skin concerns can be managed with suitable skincare. However, medical assessment may be appropriate in some circumstances.
These include:
A qualified medical professional can assess whether the condition is acne, another disorder affecting the hair follicles, an irritation reaction or a different skin condition.
Not every concern requires prescription medication or a procedure. Management depends on the diagnosis, severity, medical history and individual needs.
Small facial bumps, blackheads, acne marks and pigmentation are not always caused by the same process.
Some changes, including visible pores and sebaceous filaments, are normal features of the skin.
Others may reflect acne, irritation or a condition that requires a different approach.
Maintaining a gentle skincare routine, avoiding unnecessary irritation and recognising when symptoms need evaluation can support better skin-care decisions.
The goal of skincare is not to remove every visible pore or achieve perfectly uniform skin. It is to maintain skin health and address genuine concerns using appropriate, evidence-informed care.
[1] Reynolds RV, et al. (2024). Guidelines of care for the management of acne vulgaris. Journal of the American Academy of Dermatology, 90(5), 1006.e1–1006.e30.
DOI: https://doi.org/10.1016/j.jaad.2023.12.017
[2] Sukanjanapong S, Ploydaeng M, Wattanakrai P. (2024). Skin Barrier Parameters in Acne Vulgaris versus Normal Controls: A Cross-Sectional Analytic Study. Clinical, Cosmetic and Investigational Dermatology, 17, 2427–2436.
DOI: https://doi.org/10.2147/CCID.S476004
[3] Mar K, et al. (2024). Treatment of Post-Inflammatory Hyperpigmentation in Skin of Colour: A Systematic Review. Journal of Cutaneous Medicine and Surgery, 28(5), 473–480.
DOI: https://doi.org/10.1177/12034754241265716
Medical information notice: This article provides general educational information and does not replace individual medical assessment, diagnosis or treatment. Individual skin conditions and treatment needs may vary.
