‘Pityriasis Versicolor’ is caused by
**Core Concept**
Pityriasis Versicolor is a common skin condition characterized by patches of discoloration on the skin, typically on the chest, back, and shoulders. It is caused by a fungal infection, specifically by the **Malassezia** species, which is a type of yeast that naturally occurs on the skin. The condition is also known as tinea versicolor.
**Why the Correct Answer is Right**
The correct answer is related to the **Malassezia** species, which is a lipophilic yeast that thrives in oily areas of the skin. When the yeast grows out of control, it can cause the skin to become discolored, leading to the characteristic patches of Pityriasis Versicolor. The exact mechanism involves the yeast's ability to break down the skin's natural oils, leading to an inflammatory response and subsequent skin discoloration.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not related to the **Malassezia** species.
**Option B:** Incorrect because it is not a known cause of Pityriasis Versicolor.
**Option C:** Incorrect because it is not a type of fungus that causes this condition.
**Option D:** Incorrect because, although it is a type of fungus, it is not the specific cause of Pityriasis Versicolor.
**Clinical Pearl / High-Yield Fact**
Pityriasis Versicolor is more common in warm and humid climates, and it can be treated with topical antifungal medications. It's essential to note that the condition can recur, so preventive measures such as using antifungal shampoos and avoiding oily skin products can be helpful.
**Correct Answer:** D. Malassezia furfur.