Pityriasis<unk>  commonly causes hypopigmentation in people with dark skin tones. Pityriasis<unk>  in a man and electron micrograph of his skin showing round Malassezia spores (S) The symptoms of this condition include: * Occasional fine scaling of the skin producing a very superficial ash-like scale * Pale, dark tan, or pink in color, with a reddish undertone that can darken when the patient is overheated, such as in a hot shower or during/after exercise. Tanning typically makes the affected areas contrast more starkly with the surrounding skin. * Sharp border Pityriasis<unk>  is more common in hot, humid climates or in those who sweat heavily, so it may recur each summer. The yeasts can often be seen under the microscope within the lesions and typically have a so-called "spaghetti and meatball appearance" as the round yeasts produce filaments. In people with dark skin tones, pigmentary changes such as hypopigmentation (loss of color) are common, while in those with lighter skin color, hyperpigmentation (increase in skin color) is more common. These discolorations have led to the term "sun fungus". Pathophysiology== In cases of<unk>  caused by the fungus Malassezia furfur, lightening of the skin occurs due to the fungus's production of azelaic acid, which has a slight bleaching effect.
Tinea versicolor
Pityriasis rosea
Tinea faciei
Dermatophytosis
Tinea corporis
Tinea incognita
Keratoderma blennorrhagicum
Lichen scrofulosorum