Why do teenage blemishes leave dark marks?

Beneath the Surface · Part 9

Why do teenage blemishes leave dark marks?

The blemish is gone, but the mark is still there.

For many teenagers — especially those with darker skin tones — that stubborn mark can last far longer than the original spot. So why does it happen?

What causes dark marks after teenage blemishes?

When a blemish becomes inflamed, the skin naturally releases chemical signals as part of its immune response.

Those localized signals can simultaneously stimulate melanocytes, which are the specialized cells that produce melanin. The result is a pool of extra pigment in the exact area where the inflammation happened. This is known as post-inflammatory hyperpigmentation, or PIH (Maghfour et al., 2022).

In simple terms, the blemish itself settles down, but the skin's protective pigment response lingers behind.

Are dark marks the same as acne scars?

No. This distinction matters heavily.

A dark, flat mark left behind after a blemish is typically a temporary pigment change rather than a true scar. True acne scars involve a permanent structural change in the skin, appearing as deep depressions or raised, textured tissue.

Post-inflammatory hyperpigmentation leaves the surface of the skin completely intact but temporarily changes its color. That is why dark marks after teenage blemishes can look dramatic without actually being a permanent scar.

Why are some teenagers more prone to dark marks?

While PIH can happen across any skin tone, it is significantly more common and can be far more persistent in darker skin tones (Kashetsky et al., 2024).

The rule of thumb here is simple: the stronger the initial inflammatory response, the greater the chance that heavy pigmentation will follow. Picking, squeezing, and repeatedly irritating a healing blemish adds more surface inflammation to the area — which is another excellent reason to leave the skin alone.

What about red or purple marks?

Not every mark left after a breakout is brown.

Some teenagers are left with bright red, pink, or purple marks after inflammation settles. These are typically related to temporary changes in the small blood vessels of the skin rather than excess melanin.

Because of this, "acne marks" are not all the same thing, and they are definitely not all permanent scars.

What does this mean for teenage skincare?

The single best place to start treating a dark mark is by preventing the initial blemish from getting inflamed.

Keep the daily routine gentle and consistent. Completely avoid aggressive picking and rough scrubbing. At Upenya, that means sticking with our core three-step routine: Exfoliating Cleanser, Moisturising Gel, and Blemish Care, rather than panicking and adding five strong active products every time a new mark appears.

Daily sun protection matters immensely too. Ultraviolet (UV) and visible light can actively make existing pigmentation darker and more persistent, particularly in skin that is already highly prone to PIH (Mar et al., 2025).

The bottom line

A teenage blemish can completely disappear and still leave extra pigment in its wake.

That dark mark is typically post-inflammatory hyperpigmentation, not a permanent structural scar. It is simply the skin's natural pigment system responding to localized inflammation.

The spot itself may have been temporary, but the color change can take a longer to fade.

Frequently asked questions

Why does my teenager get dark marks after every blemish?

Certain skin types are genetically more prone to post-inflammatory hyperpigmentation, particularly darker skin tones. Localized inflammation stimulates extra melanin production in the affected tissue (Maghfour et al., 2022).

Are dark acne marks permanent?

Not always. Many pigment changes fade gradually over time, though the exact timeline varies by individual. Deeper pigment that sits lower in the skin can persist for longer.

Does squeezing blemishes cause dark marks?

Yes. Picking and squeezing increases local inflammation and physical skin injury, which heavily increases the likelihood of post-inflammatory pigmentation.

Are red acne marks the same as dark marks?

No. Brown or grey marks are typically linked to excess melanin pigment, while red, pink, or purple marks reflect lingering blood vessel changes left over after inflammation.

When should my teenager see a dermatologist?

Seek professional advice if pigmentation is persistent, causing emotional distress, or difficult to distinguish from structural scarring. NICE guidelines also recommend considering a medical referral when acne triggers persistent pigmentary changes (NICE, 2026).

References

Kashetsky, N. et al. (2024) ‘Post-inflammatory hyperpigmentation: A systematic review of treatment outcomes’, Journal of the European Academy of Dermatology and Venereology, 38(3), pp. 470–479. doi: 10.1111/jdv.19566.

Maghfour, J., Olayinka, J., Hamzavi, I.H. and Mohammad, T.F. (2022) ‘A focused review on the pathophysiology of post-inflammatory hyperpigmentation’, Pigment Cell & Melanoma Research, 35(3), pp. 320–327. doi: 10.1111/pcmr.13038.

Mar, K. et al. (2025) ‘Prevention of post-inflammatory hyperpigmentation in skin of colour: A systematic review’, Australasian Journal of Dermatology, 66, pp. 119–126. doi: 10.1111/ajd.14432.

National Institute for Health and Care Excellence (NICE) (2026) Acne vulgaris: management. NICE guideline NG198. Available at: https://www.nice.org.uk/guidance/ng198 (Accessed: 8 September 2026).