Tinea versicolor is a common fungal skin infection that usually appears as light or dark patches on the shoulders, chest, or back, especially in hot weather or if there is more sweating. It happens when a normal skin yeast grows more than usual and affects skin colour, which is why the patches can look uneven or slightly scaly. Treatment usually works best with regular use of antifungal creams or washes containing ingredients like ketoconazole or selenium sulfide. These help reduce the yeast on the skin and slowly allow the colour to normalise, although the colour change may take a few weeks to settle, even after the infection is controlled. Keeping the skin clean, dry, and avoiding excessive sweating or tight clothing can help prevent it from coming back. Sometimes doctors may suggest oral antifungal medicines if the patches are widespread or not improving with creams alone, but that decision depends on examination. It is also important to avoid oily lotions on affected areas, as they can sometimes worsen fungal growth. If the patches keep recurring or spreading despite treatment, a dermatologist review is needed to confirm the diagnosis and adjust therapy for better control.