Congratulations on curing the infection! The dark spots left behind are called post-inflammatory hyperpigmentation (PIH), not active fungus. To fade them, you can use creams containing active ingredients like Kojic acid, Azelaic acid, Niacinamide, or Vitamin C. Most importantly, apply a broad-spectrum sunscreen (SPF 30 or higher) daily to the area, as sun exposure will darken the spots and delay healing. These marks usually fade slowly over several months. I highly recommend consulting a dermatologist to get a prescription-strength topical treatment (like hydroquinone or a mild retinoid) tailored safely to your skin type.