It looks more like Intertrigo.
An intertrigo is an inflammation (rash) of the body folds (adjacent areas of skin).
An intertrigo sometimes refers to a bacterial, fungal, or viral infection that has developed at the site of broken skin due to such inflammation.
An intertrigo usually develops from the chafing of warm, moist skin in the areas of the inner thighs and genitalia, the armpits, under the breasts, the underside of the belly, behind the ears, and the web spaces between the toes and fingers. An intertrigo usually appears red and raw-looking, and may also itch, ooze, and be sore. Intertrigos occur more often among overweight individuals, those with diabetes, those restricted to bed rest or diaper use, and those who use medical devices, like artificial limbs, that trap moisture against the skin. Also, there are several skin diseases that can cause an intertrigo to develop, such as dermatitis or inverse psoriasis.
Or simply said, dry up when u wash.. if she even washes there
