**Core Concept**
Tinea versicolor is a common superficial fungal infection caused by Malassezia species, particularly Malassezia globosa. It affects the skin, leading to hyperpigmented or hypopigmented patches, often on the trunk and limbs. The condition is characterized by the overgrowth of yeast on the skin, which disrupts the normal skin pigmentary function.

**Why the Correct Answer is Right**
Tinea versicolor is caused by the overgrowth of Malassezia species, which are naturally present on the skin. The yeast feeds on the sebum produced by the sebaceous glands, leading to an imbalance in the skin's natural pH and causing the characteristic skin patches. The condition is often associated with oily skin and is more common in people who live in hot and humid climates.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Tinea versicolor is not typically associated with a strong allergic reaction, which is more characteristic of contact dermatitis.
**Option B:** This option is incorrect because Tinea versicolor is not caused by a bacterial infection, but rather by the overgrowth of a yeast.
**Option C:** This option is incorrect because while Tinea versicolor can be treated with antifungal medications, it is not contagious and is not spread through direct contact with an infected person.

**Clinical Pearl / High-Yield Fact**
One key clinical feature of Tinea versicolor is the presence of "shaggy hairs" at the borders of the affected skin patches, which is due to the yeast's ability to invade the hair follicles.

**Correct Answer: B. This option is incorrect because Tinea versicolor is not caused by a bacterial infection, but rather by the overgrowth of a yeast.**