Dark spots from acne: what the studies tested
The pimple is gone, but a dark spot stayed behind. 😩 Here's why dark spots from acne happen and what studies actually tested on them.
How do you get rid of dark spots from acne?
Start with sun protection and patience, then look at ingredients with studies behind them. ☀️ Doctors' first steps for these marks are an ingredient that targets pigment plus daily sunscreen. Spots that stay a long time can be treated in a clinic.
Reference: Davis and Callender, 2010
Good news first: these marks can fade with time. In one 12-week study, even the group using a plain gel saw their brown marks get lighter. 🙌
Reference: Shucheng et al., 2024
Sunscreen every day, and patience: the studies below checked results after 8 to 12 weeks.
Why does acne leave dark spots?
Inflammation tells the skin to make extra pigment. 🔥 A red, angry pimple can leave a brown or dark mark once it clears up. Doctors call it post-inflammatory hyperpigmentation.
Reference: Callender et al., 2011
These marks show up more often, and darker, in people with darker skin tones.
Reference: Davis and Callender, 2010
Red or pink marks are a different thing. 🔴 In one study, red marks were measured by the blood color in the skin and brown marks by pigment, each on its own.
Reference: Shucheng et al., 2024
What did studies test for acne dark spots?
Mostly azelaic acid, tranexamic acid and niacinamide. 🧪 In one trial, 60 people with acne finished 12 weeks of a 15% azelaic acid gel or the same gel without it, twice a day.
Red marks improved more with azelaic acid than with the plain gel at weeks 8 and 12. Brown marks got lighter than at the start in both groups, and the pigment reading of brown marks dropped in the azelaic acid group by week 12.
Reference: Shucheng et al., 2024
In another trial, 30 people used a 20% azelaic acid cream and 30 used a 5% tranexamic acid solution for 12 weeks. Both groups improved by about the same amount.
The azelaic acid group had more side effects in the first month.
Reference: Sobhan et al., 2023
Niacinamide was tested on dark patches in general, not only acne marks. 18 women used a 5% niacinamide moisturizer and a plain one in a paired test. Dark patches decreased more with niacinamide after 4 weeks.
Reference: Hakozaki et al., 2002
15% and 20% azelaic acid are prescription strengths in the US. PERBETE hasn't found a study of 10% serums on their own yet.
Reference: US Food and Drug Administration
Does sunscreen help dark spots from acne?
Yes, it's part of the first step. 🧴 The review on these marks puts sunscreen right next to the pigment ingredients.
Reference: Davis and Callender, 2010
Dermatologists suggest SPF 30 or higher, broad-spectrum and water resistant.
Visible light can darken skin too, especially darker skin tones, and a tinted sunscreen helps with that.
Reference: American Academy of Dermatology, 2025
Without sunscreen, a pigment serum is working against the sun every day. The dark spots page shows which ingredients have the most study.
Can the wrong skincare make acne dark spots worse?
Yes, irritation can. 😬 The same review that lists the pigment ingredients warns to be careful with all of them. Irritation can make these marks worse.
Reference: Davis and Callender, 2010
So stronger isn't always better. If a product stings and leaves your skin red, it may be doing more harm than good for these marks.
What does PERBETE's data say about acne marks?
On October 30, 2026, PERBETE's acne scars and marks page linked 18 ingredients to these marks. The strongest evidence sat behind azelaic acid, tranexamic acid and 4-butylresorcinol. 📊
On October 29, 2026, PERBETE's catalogue had 459 products listing tranexamic acid. Half of them listed it at spot 19 or later on the ingredient list.
A low spot is a hint about the amount, not the percent. The tranexamic acid study used a 5% solution.
Reference: Sobhan et al., 2023
Dents or pits in the skin are not dark spots. They are scars in the skin's shape, and a skin doctor is the right person for those. 🩺
How well does dark spot care fit YOUR skin?
Marks on darker skin, red marks, sensitive skin or a pregnancy all change the answer. 💭 Your skin type, your main worries and what else is in your routine matter too.
The free skin quiz takes 5 questions and builds a routine of 3, 5 or 7 steps around your answers, with every ingredient checked. ✨
How well does dark spot care fit YOUR skin? Take the free 5-question skin quiz