What is Cyclomethicone?
Cyclomethicone falls into the silicone category — a silicone. A volatile silicone that evaporates after application, leaving a silky feel. Low-risk at 1/5 and fungal-acne safe.
You may see it on labels as Cyclomethicone, Cyclopentasiloxane, Cyclohexasiloxane, so it can hide under more than one name in an ingredient list.
Where Cyclomethicone shows up
As a silicone, Cyclomethicone typically appears in primers, serums, moisturisers, and hair products, where it smooths and blurs. Separately from clogging, its irritancy is rated 0/5 — low, so it's unlikely to sting or sensitise on its own.
Is Cyclomethicone bad for acne-prone skin?
That low score makes Cyclomethicone a reasonable choice even for acne-prone skin. As always, individual reactions vary, but it is not a likely cause of clogged pores.