The red dot with burning could be irritant folliculitis or early fungal infection, common in warm, occluded areas.
Next Steps
Keep the area dry. Apply a mild antifungal cream with anti-inflammatory action (e.g., clotrimazole + beclomethasone).
Health Tips
Avoid friction and synthetic underwear. Since intimate area rashes have many causes, a proper diagnosis needs detailed history and clearer images. I recommend an online consultation with a dermatologist for personalised treatment.