Is a post-acne mark the same as an acne scar?
No. A mark is a colour change on the surface, while a scar is a structural change left as a dent or raised area in the tissue. The approaches differ.
Flat red or brown marks do not change skin texture and may lessen with time. Indented scars result from collagen loss and may not improve noticeably on their own.
Looking at the skin with light from the side can help: a mark stays flat, whereas a scar casts a shadow. A firm distinction still needs an examination.
Why do red and brown marks form?
Red marks come from small surface vessels widening after inflammation, while brown marks come from increased pigment production in response to inflammation.
Brown marks tend to look more pronounced and fade more slowly on darker skin tones. Sunlight stimulates pigment and can darken them. Squeezing or scratching spots adds inflammation and may worsen the marks.
Red marks usually fade sooner, though this too can take months. Patience and avoiding irritation both matter.
How long until the marks fade?
It varies; superficial marks may fade within a few months and some take longer. Sun protection and keeping new spots under control affect the timeline.
If new spots keep forming, new marks keep being added. Controlling active acne is therefore the priority for marks to clear.
Marks that have not changed for more than four to six months, or that are darkening, are worth a medical assessment.
Which treatment options may be considered?
A doctor may consider sun protection, topical products that reduce pigment or support cell turnover, superficial peels in suitable cases and some light or laser methods.
On darker skin tones aggressive procedures can worsen pigmentation, so careful selection is needed. The methods are described separately on the pigmentation, peel and device pages.
In pregnancy, breastfeeding, after recent sun exposure or with photosensitising medicines, many procedures are postponed. These must be mentioned at the consultation.
Frequently asked questions
Do acne marks fade by themselves?
Most superficial marks fade over time, though the timeline varies and sun protection is needed.
Why is sunscreen so important?
Sun stimulates pigment production and can darken brown marks; protection is the basis of the process.
Can lemon or similar home mixtures be used?
This is not advised. They can cause irritation and light-related discolouration.
Do the same methods apply to indented scars?
No. Indented scars are structural and need different methods; see the acne scars page.
Sources (4)
- American Journal of Clinical Dermatology: The Pathogenesis and Management of Acne-Induced Post-inflammatory Hyperpigmentation (2021)
- Journal of the European Academy of Dermatology and Venereology: Post-inflammatory hyperpigmentation: A systematic review of treatment outcomes (2023)
- American Academy of Dermatology: Acne scars: Consultation and treatment
- American Academy of Dermatology (JAAD): Guidelines of care for the management of acne vulgaris (2024)
This content is for general information and does not replace a personal medical assessment.