What is Talc?
Chemically, Talc is a mineral-based ingredient. A mineral powder used in makeup for slip and absorption, rated 1/5.
You may see it on labels as Talc, Talcum, so it can hide under more than one name in an ingredient list.
Where Talc shows up
Talc is commonly formulated into sunscreens, mineral makeup, and masks. Separately from clogging, its irritancy is rated 0/5 — low, so it's unlikely to sting or sensitise on its own.
Is Talc bad for acne-prone skin?
That low score makes Talc a reasonable choice even for acne-prone skin. As always, individual reactions vary, but it is not a likely cause of clogged pores.