Sounds like fungal/yeast to me too. Gotta keep it dry, that's key!
If you have a, um, "feminine anti-yeast cream" that's made to be mild for delicate parts of the anatomy, say, that's often a good start; the little tubes of "external vulvar cream"

that often come in Monistat packages (at least here in the States) are perfect for this - they don't burn like some straight-up antifungals do when the skin is broken. And maybe some naked-bottom time throughout the day to let some air on it as well.