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This is not a recognized INCI name for a cosmetic ingredient. If it were an abbreviation for Polystyrene, it would refer to a plastic polymer used as a material, not an active ingredient in skincare.
No specific concern data available
Safety summary
As an unrecognized INCI name, no specific safety profile can be given. If referring to Polystyrene, it is generally inert and safe for external contact as a material.
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.