Lichen planus is a fungal infection of the superficial layers of the skin that manifests as scaly-covered patches of altered pigmentation. This infection is more commonly caused by Malassezia furfur infection and is especially common in young people. Follicular furuncle is rarely painful or itchy, but it prevents the area of the lesion from tanning, making the lesion lighter in color than the surrounding normal skin. People with darker skin tones may notice lighter colored patches. The patches often appear on the chest and back and may be flaky. Over time, small lesions may merge into larger patches. Doctors diagnose the condition by its clinical presentation. The doctor may use an ultraviolet light to visualize the lesions more clearly or examine the scales of the lesions under a microscope to help confirm the diagnosis. Topical antifungal creams such as ketoconazole and terbinafine spray may be used. Applying selenium disulfide shampoo thickly to the lesion area overnight and washing it off early the next morning is also effective and needs to be continued for 3-4 nights. Alternatively, apply the shampoo for 10 minutes every day for 10 days. Ketoconazole shampoo is also effective. Apply for 5 minutes and wash off. Often used alone once or once a day for 3 days. For generalized, refractory infections, oral antifungal drugs such as itraconazole, ketoconazole, and fluconazole are sometimes given. However, since these drugs have unsatisfactory side effects, topical antifungal drugs are still preferred. After the infection subsides, the skin color does not return to its normal color even after several months. Florid chafing can still recur after successful treatment because the causative fungus is a resident of the skin. This is why doctors recommend monthly or bimonthly topical application of 2.5% selenium disulfide shampoo or ketoconazole shampoo to prevent flare-ups.