Itching, flaky skin and an off odor over 2 to 3 weeks usually point to a vaginal infection, most often a yeast infection or bacterial vaginosis, with some vulvar skin irritation added in. The dryness and flaking on the labia itself can also mean mild irritation from moisture or soap sitting on skin that's already inflamed.
Next Steps
Wear loose cotton underwear, avoid scented soap or wipes down there, and keep the area dry. A vaginal swab test will confirm which infection it is so the right treatment can start.
Health Tips
See a gynaecologist in person if the skin starts to crack, bleed or look white and thickened, since that needs a closer look.