Potassium Stearate needs consideration within its finished cleansing product. The checked cosmetic assessment requires a formula that does not cause irritation or sensitisation, rather than treating the ingredient name as a guarantee of tolerance.

Its fatty-acid salt composition supports a theoretical Malassezia screen. That interpretation does not establish a growth response from this exact soap ingredient, topical availability or a flare. Cleansing conditions and the complete formula matter. Consider the intended product use and your skin’s response, and discuss persistent irritation with a clinician or pharmacist.