Succinic Acid Treatment
Budget Blemish Fighter
Verified reviewer
Pros & cons.
- +Triple-active formula attacks breakouts through three different mechanisms simultaneously
- +Visible blemish reduction often within 24-48 hours of first application
- +Hyaluronic acid and squalane prevent the excessive drying typical of multi-active treatments
- +Excellent value at $8.99 for a multi-ingredient acne spot treatment
- +Succinic acid offers a novel antimicrobial approach less prone to bacterial resistance
- +Fragrance-free and suitable for acne-prone skin
- −Noticeable green tint limits daytime usability for lighter skin tones
- −Faint sulfur smell on application may be off-putting to some users
- −Small 15ml tube depletes quickly for those with frequent, widespread breakouts
- −Three active ingredients increase the risk of dryness and irritation if overused
- −Not suitable for use during pregnancy due to salicylic acid content
The full review.
Succinic acid is a dicarboxylic acid from organic chemistry. Found in amber and various organisms, it entered skincare research when studies showed Cutibacterium acnes—the bacteria causing inflammatory acne—is vulnerable to it. The INKEY List used this research to build an affordable spot treatment.
The formula uses a triple-active approach to attack breakouts from three angles. Succinic acid at 2% provides antimicrobial and anti-inflammatory action; it targets bacteria while reducing redness and swelling. Colloidal sulfur at 2% absorbs excess oil and acts as a keratolytic to soften the dead skin and sebum plugs blocking pores. Salicylic acid at 1% penetrates the pore lining to dissolve congestion. Three mechanisms, one tube, one application.
This architecture is smart. Most spot treatments use one lane: benzoyl peroxide for bacteria, salicylic acid for pores, or sulfur for oil. This treatment combines all three at moderate concentrations to cover more bases without causing irritation. The 1% salicylic acid is lower than the standard 2% to prevent overwhelming the skin alongside the other actives.
Hyaluronic acid at 0.4% and squalane address the dryness common in multi-active acne treatments. These humectants and emollients create a moisture buffer to prevent flaking or peeling. This design choice makes the treatment tolerable for daily use, whereas aggressive formulas often require skipping days.
The texture is a thick, green-tinted cream with a paste-like consistency. The chlorophyllin-copper complex colorant gives the product a visible green tint, especially on lighter skin. This makes it a nighttime-only product for most users, unless you cover the green patches with makeup.
The product has a faint sulfur smell. It is not strong like sulfur hot springs scents, but you can detect it closely upon application. It dissipates within minutes and does not linger on the skin or pillowcase.
Results follow a clear timeline. Active blemishes typically show less size and redness within 24-48 hours of the first application—faster than salicylic-acid-only treatments for most users. The sulfur draws oil out and dries the blemish quickly. After 1-2 weeks of consistent use, new breakouts appear less often. Full benefits, including reduced pore congestion and fewer breakouts, develop over 4-6 weeks.
Moderation is key. Three active ingredients mean three potential sources of dryness. Using too much, applying too often, or layering with other actives like retinol, other BHAs, or benzoyl peroxide can cause irritation. While squalane and hyaluronic acid buffer this, users with dry or sensitive skin should use caution and follow with moisturizer.
At $8.99 for 15ml, the volume fits a spot treatment. If used as directed on individual blemishes rather than the full face, the tube lasts 2-4 months for most acne patterns. The per-use cost is low, providing three treatments in one product instead of layering separate BHA, sulfur, and antimicrobial products.
The Succinic Acid Treatment shows The INKEY List at its most creative: using emerging research, combining established actives at thoughtful concentrations, adding moisturizing buffers, and pricing it below $10. It does not replace a dermatologist’s treatment plan for severe or cystic acne, but for mild to moderate breakouts—like occasional flare-ups, chin breakouts, or forehead congestion—it is a complete treatment in a small tube.
Formula
Texture
The texture is a thick, green-tinted cream with a paste-like consistency.
Scent
There is a faint sulfur smell. It is not strong like sulfur hot springs scents, but it is detectable closely upon application. It dissipates within minutes and does not linger on the skin or pillowcase.
Best for
The Succinic Acid Treatment shows The INKEY List at its most creative: using emerging research, combining established actives at thoughtful concentrations, adding moisturizing buffers, and pricing it below $10. It does not replace a dermatologist’s treatment plan for severe or cystic acne, but for mild to moderate breakouts—like occasional flare-ups, chin breakouts, or forehead congestion—it is a complete treatment in a small tube.
Works for
Active blemishes typically show less size and redness within 24-48 hours of the first application—faster than salicylic-acid-only treatments for most users. The sulfur draws oil out and dries the blemish quickly. After 1-2 weeks of consistent use, new breakouts appear less often. Full benefits, including reduced pore congestion and fewer breakouts, develop over 4-6 weeks.
Not ideal for
It does not replace a dermatologist’s treatment plan for severe or cystic acne.
AM routine
Not explicitly mentioned, but the green tint makes it a nighttime-only product for most users.
PM routine
Not explicitly mentioned, but the green tint makes it a nighttime-only product for most users.
Ingredient analysis.
Full INCI list
Water (Aqua/Eau), Caprylic/Capric Triglyceride, Glyceryl Stearate SE, Stearic Acid, Cetearyl Alcohol, Colloidal Sulfur, Glycerin, Succinic Acid, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Salicylic Acid, Phenoxyethanol, Squalane, Benzyl Alcohol, Sodium Hyaluronate, Polysorbate 60, Ethylhexylglycerin, Sodium Hydroxide, Dehydroacetic Acid, Malachite Extract, Sorbitan Isostearate, Trisodium Ethylenediamine Disuccinate, CI 75810 (Chlorophyllin-Copper Complex)
Skin match.
The science.
The Science
Research into the skin microbiome identifies succinic acid as an acne-fighting ingredient. A study in the Journal of Clinical Investigation (Barnard et al., 2020) shows Cutibacterium acnes strains produce succinic acid-degrading enzymes at different rates, and that healthy skin strains have different metabolic profiles than acne-associated strains. Topical succinic acid lacks extensive clinical trials, but its dicarboxylic acid structure relates to azelaic acid, which has proven anti-inflammatory and antimicrobial efficacy for acne.
Colloidal sulfur has treated skin conditions for centuries; modern evidence confirms its keratolytic and mild antimicrobial properties. The colloidal (finely suspended particle) form in this product increases skin contact and absorption over precipitated sulfur. Sulfur's sebostatic properties—reducing oil production—complement the BHA's pore-clearing action.
Salicylic acid at 1% provides evidence-based exfoliation. Although below the 2% maximum OTC concentration, 1% salicylic acid dissolves intracellular lipid bonds in the pilosebaceous unit. This lower concentration manages the total irritation load when used with two other active acne-fighting ingredients.
Squalane and sodium hyaluronate act as moisturizing agents. This follows dermatological logic that acne treatment should maintain skin hydration instead of just drying out lesions—a method that reduces compensatory sebum production and supports barrier function during treatment.
Dermatologist Perspective
Dermatologists see this triple-active approach as a smart mix of established (sulfur, salicylic acid) and emerging (succinic acid) acne-fighting ingredients. Board-certified dermatologists often prescribe sulfur-based treatments for inflammatory acne; adding a low-dose BHA and a novel antimicrobial creates a multi-target approach at moderate concentrations. Dermatologists would value the moisturizing ingredients but would tell patients to use it only as directed, avoid mixing it with other active acne treatments on the same area, and always follow with moisturizer. For moderate to severe acne, dermatologists would likely suggest this as an adjunct to—not a replacement for—prescription treatments.
Where it fits in your routine.
Apply a small amount to active blemishes or breakout-prone areas after evening cleansing. A thin layer works; do not pile it on. Let the treatment set for 1-2 minutes before applying moisturizer. Use morning and evening, though the green tint makes PM use more practical. Start once daily and increase to twice daily if tolerated. Always follow with moisturizer and use SPF the next morning.
At $8.99 for 15ml, this is a highly cost-effective multi-active spot treatment. One targeted product provides three acne-fighting ingredients and hydrating support. The small tube size fits spot treatment use and lasts longer than the volume implies. Buying salicylic acid, sulfur, and antimicrobial products separately costs more than this all-in-one approach under $9, which offers value for recurring breakouts.
Oily and combination skin with mild to moderate inflammatory breakouts, occasional blemishes, or persistent acne-prone areas. Budget-conscious consumers seeking a multi-active spot treatment. Users wanting an alternative to benzoyl peroxide to avoid bleaching fabrics.
Dry or sensitive skin types prone to irritation from active treatments. Pregnant or nursing individuals because of the salicylic acid content. People with severe cystic acne — this spot treatment targets mild to moderate concerns and does not replace dermatological care.
Product details.
Thick, creamy gel has a visible green tint from the chlorophyllin-copper complex. This paste-like consistency works for targeted spot application.
A faint sulfur smell is noticeable on close inspection but dissipates within minutes of application.
A small 15ml white squeeze tube with a green accent matches The INKEY List's minimal aesthetic. The small size shows it is a targeted spot treatment, not a full-face product.
The green color shows immediately upon application. The cream blends into a subtle tint visible on lighter skin tones. A faint sulfur smell exists during application but fades fast. Some users experience mild dryness or tightness around the treated area within the first few days — this is normal as the actives dry out the blemish.
2-4 months depending on frequency and severity of breakouts
12 months
All Year
The backstory.
Succinic acid is a relatively novel acne-fighting ingredient that emerged from research into the skin microbiome. Studies found that Cutibacterium acnes bacteria are less resistant to succinic acid than to traditional acne treatments, making it a promising alternative or complement to established actives. The INKEY List was among the first brands to bring succinic acid to a mainstream, affordable spot treatment format.
About The INKEY List
Emerging Brand (2–5 years)The INKEY List launched in 2018, focusing on ingredient transparency and accessible pricing. The Succinic Acid Treatment uses less conventional actives; succinic acid is a newer acne-fighting ingredient than established options like benzoyl peroxide.
Common myths.
The green color means the product contains harsh chemicals
Chlorophyllin-copper complex (CI 75810), a natural colorant from chlorophyll, creates the green tint. This color is purely cosmetic and does not change the product's efficacy or safety. Some users use it as a visual indicator to see where they applied the treatment.
Spot treatments should sting to work
This treatment uses moderate-strength actives to reduce blemishes without pain or visible peeling. Stinging means irritation, not efficacy. The succinic acid in this formula works via antimicrobial and anti-inflammatory mechanisms rather than aggressive surface-level acid action.
FAQ.
What is succinic acid and how does it fight acne?
Succinic acid is a dicarboxylic acid that fights acne via antimicrobial and anti-inflammatory mechanisms. Research shows it works against Cutibacterium acnes — the bacteria that triggers inflammatory breakouts — and reduces redness and swelling in active blemishes. This formula uses succinic acid with sulfur and salicylic acid for a triple-action approach.
How do I use The INKEY List Succinic Acid Treatment?
Apply a thin layer directly onto active blemishes after evening cleansing. You can also apply a thin layer to breakout-prone areas like the chin or forehead. Follow with moisturizer. The green tint shows on skin, so most users apply it at night. Use consistently for best results.
Can I use The INKEY List Succinic Acid Treatment all over my face?
This spot treatment works as a thin layer across acne-prone zones. Using it all over the face increases dryness and irritation risks because it contains three active acne-fighting ingredients. Apply it to spots first, then expand coverage if your skin tolerates it.
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Why does The INKEY List Succinic Acid Treatment look green?
Chlorophyllin-copper complex, a naturally derived chlorophyll colorant, provides the green color. It has no therapeutic function and is purely cosmetic. The green tint shows upon application; use it at night or under high-coverage makeup.
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Can I use this treatment with retinol?
Do not apply both products to the same area at once. Combining retinol with three acne actives (succinic acid, sulfur, salicylic acid) causes excessive irritation and dryness. Use retinol on unaffected areas while applying this treatment to blemishes, or alternate nights.
Is The INKEY List Succinic Acid Treatment safe during pregnancy?
This product contains 1% salicylic acid, which is generally advised against during pregnancy in leave-on products. Consult your healthcare provider before using this treatment if you are pregnant or nursing.
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What the community says.
"Reduces blemish size noticeably within 1-2 days"
"Effective at making breakouts heal faster"
"Affordable alternative to prescription spot treatments"
"Hydrating enough that it doesn't cause excessive flaking"
"Green tint is very visible on skin"
"Can cause dryness if overused or used without moisturizer"
"Some users report initial purging"
"Small 15ml tube runs out quickly for frequent breakout sufferers"
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