Well a pimple is just a clogged pore and you do have pores there. You really don't want talc going up your hoo-hah, cuz you're basically sending little foreign cancer causing agents into your abdomen parts unknown. So you don't want to make that a habit. As for the pimple, you are probably just experiencing irritation. Be gentle and keep the area clean until it heals. I use monistat creams for lube for my personal play sessions, I think it keeps the cooties in check. The pimple should clear up on its own with basic minimal care, see a doctor if you get a fever or suspect a staph infection.