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Verdict: KIEHL'S SINCE 1851 Blue Herbal Spot Treatment ($18) is a 71% match dupe for PETER THOMAS ROTH AHA/BHA Acne Clearing Gel ($54). Full price and ingredient comparison below.

By the BeautyFlow Research Team · Updated August 2026

The Original

✨
PETER THOMAS ROTH

AHA/BHA Acne Clearing Gel

$54

The Dupe

💜
KIEHL'S SINCE 1851

Blue Herbal Spot Treatment

$18
71% match
·curated verified
Shop the Dupe· $18Shop Original· $54
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Curated by BeautyFlow editors

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Ingredient Comparison

PETER THOMAS ROTH· $54

Ingredient data coming soon

KIEHL'S SINCE 1851· $18

Ingredient data coming soon

Frequently Asked Questions

Is KIEHL'S SINCE 1851 Blue Herbal Spot Treatment a good dupe for PETER THOMAS ROTH AHA/BHA Acne Clearing Gel?

Yes — KIEHL'S SINCE 1851 Blue Herbal Spot Treatment is a 71% match for PETER THOMAS ROTH AHA/BHA Acne Clearing Gel based on ingredient and formula comparison.

How much cheaper is KIEHL'S SINCE 1851 Blue Herbal Spot Treatment than PETER THOMAS ROTH AHA/BHA Acne Clearing Gel?

KIEHL'S SINCE 1851 Blue Herbal Spot Treatment costs $18 versus $54 for PETER THOMAS ROTH AHA/BHA Acne Clearing Gel — a saving of $36.

What is the difference between PETER THOMAS ROTH AHA/BHA Acne Clearing Gel and KIEHL'S SINCE 1851 Blue Herbal Spot Treatment?

The main difference is price — PETER THOMAS ROTH AHA/BHA Acne Clearing Gel costs $36 more. Formulas are closely matched in our comparison, though packaging and shade ranges may differ. See the full ingredient table on this page for the exact overlap.

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