Closed Comedones: A 4-Week Count Map for Forehead, Cheeks, and Chin

Why do closed comedones keep coming back in the same spot?

Often something, whether an object, a product, or your hand, touches that spot every day. The repeated contact differs by zone: bangs and hair products on the forehead, face masks around the chin and mouth, and pillows and phones on the cheeks. In Korea these tiny white bumps are called “jopssal,” after millet grains.

In a 2023 survey of 227 health care workers, 68.7% had mask-related breakouts, and sex and hours of mask wear came out as risk factors. The Korean Dermatological Association, a Korean professional society, explains that acne that first appears in adulthood tends to center on the lower jaw. Even so, do not conclude that a breakout on the chin must be the mask’s fault; check in your log whether the same factor keeps overlapping in the same box week after week.

Do you get more small bumps on your forehead in summer?

In summer, oil and sweat go up and bangs and hats stay pressed on your forehead longer, stacking the conditions for a higher forehead count. The Korea Disease Control and Prevention Agency (KDCA), Korea’s national public health agency, explains that oil output rises 10% for every 1°C (1.8°F) rise in body temperature, so acne that had calmed down can get worse in summer.

So in summer, next to the forehead box, write down sweaty days, hours in a hat or helmet, and any hair product used to hold your bangs in place; in the cheek boxes, separately note the day you changed your pillowcase, your phone habits, and how long you rest your face on your hand. In a 2011 survey of 1,236 acne patients at 17 Korean hospitals, acne was most common on the forehead and cheeks and more severe on the cheeks, so count the cheek boxes on the same day instead of only watching your forehead. A one-line note about your day, like sitting in class with damp bangs after gym or wearing a bike helmet on your commute, makes the 4-week comparison easier.

Why do small white bumps show up on my face?

The small white bumps often called “whiteheads” are usually closed comedones, whose openings are shut. The KDCA explains that open comedones look dark because of melanin, while closed comedones look white.

The Korean Dermatological Association groups open and closed comedones together as non-inflamed lesions. That is why your 4-week map counts white bumps and red, swollen bumps separately. If red bumps are mixed in and rising in a box, check the visit guide below before you change your care routine.

How often and how should you count over 4 weeks?

Count once a week, on the same weekday, in the same light, in front of the same mirror. If you count every day, differences in lighting and how your skin looks that day can easily seem bigger than the actual change, so leave a week between counts.

No study we found compares ways of counting bumps by zone, so once a week over 4 weeks is this article’s own editorial standard. What to write next to the count, though, has some backing. In a 2011 survey of 1,236 Korean acne patients, stress, lack of sleep, and periods were named as aggravating factors, so mark where you are in your menstrual cycle and any weeks of short sleep, such as exams or late nights at work. A difference of one or two may just be the lighting, so look at the 4-week trend rather than a single week’s number.

If you start a new cream or mask, how many weeks should you watch?

Think of 4 weeks as one unit. The 2021 comedogenicity test also judged creams by comparing microcomedone counts after 4 weeks of application, and over that period the positive control raised microcomedones by an average of 365.4%.

That test, however, used product kept covered on back skin, so the results are not the same as on the face. When you start a new cream or skincare mask for closed comedones, mark that week on your map and keep every other product the same for the next 4 weeks; only then can you tell whether a box that grew is down to the product.

4-week closed comedone map by zone

After 4 weeks, change just one factor, in the box that grew the most since week 1, for the next 4 weeks. If you change several boxes at once, you will no longer be able to tell what helped.

When should you have a dermatologist look at these bumps?

• If the count stays the same or rises after close to 8 weeks of the same care, see a dermatologist.
• If the box for red, swollen, painful bumps grows faster than the box for white bumps, have a dermatologist check your skin.
• A hard white bump that has not changed size or shape for months may be something other than acne, so have a dermatologist tell them apart.
• If spots you squeezed or picked start leaving marks, consider talking with a dermatologist.

Summary of the evidence used

• A 2011 survey of 1,236 acne patients at 17 Korean hospitals (PMID 21595660) found acne was most common on the forehead and cheeks, and stress, lack of sleep, and periods were reported as aggravating factors.
• A 2023 survey of 227 health care workers (PMID 36357553) found 68.7% had mask-related breakouts, and hours of wear was a risk factor (p=0.048).
• A 2021 test of cream comedogenicity using 4 weeks of covered application (PMID 34471722) found the positive control raised microcomedones by an average of 365.4%.