I started developing a rash on the inner leg where it connects to testicles, the fold, on both sides of inner thigh. What could this be? Doesn't hurt

Intertrigo. Intertrigo (intertriginous dermatitis) is an inflammatory condition of skin folds, induced or aggravated by heat, moisture, maceration, friction, and lack of air circulation. Intertrigo frequently is worsened or colonized by infection, which most commonly is candidal but also may be bacterial, fungal, or viral. Intertrigo commonly affects the axilla, perineum, inframammary creases, abdominal folds.