

Blackheads and whiteheads are two common types of acne that occur when pores become clogged with oil, dead skin cells, and other debris. They share similar underlying causes but differ in how they appear and react to the environment.
Blackheads, or open comedones, form when the clogged pore remains open, which allows the contents to oxidise and turn black due to air exposure. Whiteheads, or closed comedones, occur when the pore remains sealed under a layer of skin, preventing air from reaching the trapped materials, which remain white or yellow. Both types can develop in areas with a high concentration of sebaceous glands, such as the face, back, and chest– but they manifest differently based on whether the pore is open or closed.
| Characteristic | Blackheads (Open Comedones) | Whiteheads (Closed Comedones) |
| Appearance | Black, due to oxidation of trapped material exposed to air | White or yellow, as the pore is closed under the skin |
| Pore Status | Open, allowing air to enter and oxidise contents | Closed, sealed by a thin layer of skin |
| Size | Often larger and more visible | Smaller and less noticeable |
| Location | Common in oily areas, especially the nose, chin, and back | Found on the face, often in the T-zone (nose, forehead) |
| Cause | Excess oil, dead skin cells, exposed to air | Excess oil, dead skin cells, trapped under the skin |
| Risk of Inflammation | Can become inflamed if bacteria enter | Less likely to become inflamed but can progress to acne |
| Treatment | Exfoliants, pore strips, salicylic acid | Retinoids, salicylic acid, gentle cleansers |
Blackheads and whiteheads are formed due to the clogging of hair follicles or pores, primarily caused by the accumulation of sebum (oil) and dead skin cells. In normal skin, sebaceous glands produce oil that helps maintain skin hydration. However, when there is an overproduction of sebum or an abnormal shedding of dead skin cells, this excess material can mix and become trapped within the hair follicle. The difference between blackheads and whiteheads lies in whether the pore remains open or closed. In blackheads, the pore remains open, allowing the trapped material inside to oxidize upon exposure to air, which causes the dark colouration characteristic of blackheads.
In contrast, whiteheads form when the clogged pore is sealed by a thin layer of skin, preventing oxidation, which keeps the trapped contents white or yellow. Both conditions involve a blockage within the follicle, but the external environment—whether air can reach the clog or not—determines the type of comedone that forms.

Blackheads, whiteheads, pimples, and papules are all different forms of acne but vary in terms of appearance, formation, and severity. Blackheads and whiteheads are non-inflammatory types of acne, caused by clogged pores, but they remain relatively mild because they do not involve infection or inflammation.
In contrast, pimples and papules are inflammatory types of acne that occur when clogged pores become infected by bacteria, leading to redness, swelling, and discomfort. Understanding the distinctions between these acne types is essential for choosing the right treatment and skin care approach. The table below illustrates the key difference between them:
| Type | Blackheads (Open Comedones) | Whiteheads (Closed Comedones) | Pimples (Pustules) | Papules |
| Appearance | Black, due to oxidation of trapped material | White or yellow, as the pore is closed | Red, swollen, with a visible white or yellow center (pus) | Red, swollen, without a visible head |
| Pore Condition | Open pore, exposed to air | Closed pore, trapped under a layer of skin | Inflamed, open or closed | Inflamed, closed |
| Involvement of Bacteria | No bacterial involvement | No bacterial involvement | Involves bacterial infection | May involve bacterial infection |
| Inflammation | Non-inflammatory | Non-inflammatory | Inflammatory | Inflammatory |
| Severity | Mild | Mild | Moderate to severe, often painful | Moderate to severe, often painful |
| Treatment Focus | Exfoliation, unclogging pores | Exfoliation, gentle cleansers | Reducing inflammation and bacteria (e.g., antibiotics, benzoyl peroxide) | Reducing inflammation (e.g., retinoids, antibiotics) |
Blackheads and whiteheads are primarily caused by clogged pores and are generally easier to manage, whereas pimples and papules require targeted treatments to address infection and inflammation.

Blackheads and whiteheads can affect a wide range of people in Singapore, with various environmental, lifestyle, and biological factors contributing to their development. Singapore’s hot and humid climate, combined with modern skin care practices and hormonal changes, can increase the risk of clogged pores, leading to these types of acne. Key risk factors for blackheads and whiteheads include:
At Harmony Therapeutics, our team of experts take a comprehensive approach to diagnosing blackheads and whiteheads. The diagnosis process typically begins with a thorough skin examination to identify the presence of comedones (clogged pores), which are characteristic of blackheads and whiteheads.
Blackheads, also known as open comedones, are easy to recognise due to their darkened appearance, caused by oxidation when the pore remains open. Whiteheads, or closed comedones, appear as small, white or yellowish bumps under the skin, indicating that the pore is sealed off.
Our experts may also assess your skin type, oil production levels, and overall skincare routine to identify contributing factors. In some cases, we use magnification tools to get a closer look at the pores and the severity of the blockages. If your acne includes other types of lesions like pimples or cysts, we may recommend further evaluation to rule out more severe forms of acne.
At Harmony Therapeutics, we offer personalised and highly effective treatments for blackheads and whiteheads, which helps us ensure that your skin feels refreshed, clear, and rejuvenated. If you have been struggling with these common skin issues, our expert team is ready to help you find the best treatment option tailored to your skin type and needs.

If blackheads and whiteheads have been affecting your confidence, reach out to us for a consultation. At Harmony Therapeutics, we are dedicated to helping you achieve radiant, glowing skin that reflects your inner confidence. Contact us today to take the first step toward clearer skin.
Alight at Somerset MRT and Exit B (street level), turn left towards Marche Movenpick and walk along the passage walkway for 2mins and you will see H&M on your left. Walk around H&M and you will see the Orchard Building lift lobby on your left.
Orchard Building has its own basement carpark. The entrance of the carpark is located opposite Orchard Cineleisure