Catterygirl I don't think anything on sale now has any actual talc in it - in the Uk and EU, anyway.
Talcum powder was potentially contaminated with asbestos. Asbestos is a known cause of cancer. Nowadays the UK and EU have strict regulations for cosmetics sold in the UK, including talcum powder.
A Google search shows an AI (
) reply saying " Commercial substitutes for talc include cornstarch, arrowroot starch, tapioca starch, and kaolin clay, which are commonly used in baby powders and cosmetics to absorb moisture and provide a smooth texture. Other alternatives are oat flour, rice powder, and baking soda, while some formulations use silica or mineral powders."
In any case, he should go to the GP or other medical advisor and find out exactly what this lump is, instead of self-diagnosing it as due to his dusting powder.