Dark spots that appear after a fungal infection or after using certain lotions on the face are often due to post-inflammatory pigmentation, which means the skin becomes darker after irritation, inflammation, or healing. In some cases, strong creams or lotions, especially those containing steroids or irritating ingredients, can also cause skin darkening, thinning, or sensitivity when used on the face. Since you had tinea corporis and tinea cruris and also applied Zalim lotion on the face, the dark spots may be related either to the fungal infection itself or to irritation from the medicine. The first step is to avoid using any strong creams/lotions on the face without a dermatologist's advice. Continue proper treatment for the fungal infection as prescribed, because incomplete treatment can cause recurrence. To help the dark spots fade safely, use a gentle face cleanser, avoid harsh scrubbing, and apply a good sunscreen regularly because sunlight can make pigmentation darker and slower to heal. A mild moisturiser and dermatologist-recommended creams containing ingredients such as vitamin C, niacinamide, azelaic acid, or kojic acid may gradually help lighten the marks, but these should be used carefully according to your skin type. Most post-fungal dark spots improve slowly over a few weeks to months with proper care and patience. If the pigmentation is increasing, the skin is becoming thin or sensitive, or the fungal infection is still active, it is best to consult a dermatologist for proper examination and safe treatment.