Skincare ingredients, checked against a published list
Two checkers, two different questions. One matches a routine against a published list of86 ingredients that comedogenicity testing has rated 1 or higher. The other applies a stated rule about the fatty acids Malassezia can use. Both run in your browser and neither asks for an account.
Neither list is issued by a regulator, because no regulator issues one. That is not a caveat hidden at the bottom of a page — it is the reason the entire list is printed on the page beside each checker, at version 2026-08-10, so you can read it rather than trust it. Where the 0–5 scale comes fromexplains why published lists disagree with one another.
Checkers
Comedogenic rating scale: where the 0-5 numbers come from
The comedogenic rating scale is a 0-5 score from a rabbit-ear assay. Where the numbers came from, why concentration moves them, and who certifies the lists.
Fungal acne safe checker (Malassezia triggers)
Paste a skincare ingredient list and see which entries match the Malassezia rule this page publishes in full, which do not, and which cannot be read.
Pore-clogging ingredients checker
Paste a skincare ingredient list and see which entries appear on the published pore-clogging list, which do not, and which could not be read at all.
Ingredient guides
Is alcohol denat bad for skin? What the evidence says
Alcohol denat is denatured ethanol, and it is absent from the 86-entry pore-clogging list published here. What it does in a formula, and where evidence stops.
Is coconut oil comedogenic? Rated 4 on published lists
Coconut oil is rated 4 of 5 on the pore-clogging list published here, reaches labels under two different spellings, and is flagged by the Malassezia rule too.
Is dimethicone comedogenic? What the lists actually say
Dimethicone is a silicone polymer, and it is absent from the 86-entry pore-clogging list published here. What it does in a formula, and what is unknown.
Is isopropyl myristate comedogenic? Rated 5 on published lists
Isopropyl myristate is rated 5 of 5 on the 86-entry pore-clogging list published here. What the number records, what it does in a formula, where it turns up.
Is phenoxyethanol safe? What the label and the rules say
Phenoxyethanol is a preservative, and it is absent from the 86-entry pore-clogging list published here. What it does in a formula and which document caps it.
Is shea butter comedogenic? Rated 0, and still flagged
Shea butter is rated 0 on the published comedogenic list this site uses, and the same butter is flagged by the Malassezia rule. Why both results hold.