**Question:** Babloo is a 5-year-old boy who presents with a small hypopigmented scaly macule on the chest. Some of his classmates also have similar lesions. The most probable diagnosis is -

A. Pityriasis alba
B. Pityriasis rosea
C. Discoid lupus erythematosus
D. Tinea corporis

**Correct Answer:** D. Tinea corporis

**Core Concept:** Tinea corporis is a fungal infection caused by dermatophytes that affects the skin, commonly presenting as a scaly, annular macule or plaque.

**Why the Correct Answer is Right:** Babloo's clinical features align with the presentation of Tinea corporis, particularly the hypopigmented macule and scaly appearance. Tinea corporis commonly occurs on the torso and presents as a well-defined, annular, erythematous, and scaly patch. The other options are less likely:

A. Pityriasis alba is a hypopigmentation condition affecting the face, usually in children, and does not typically involve the whole body.
B. Pityriasis rosea is a self-limiting cutaneous disorder characterized by a single large scaly patch and presents on the trunk, not the chest.
C. Discoid lupus erythematosus is a chronic autoimmune disorder affecting the skin, and while it can involve multiple lesions, it is not typically caused by a fungal infection.

**Why Each Wrong Option is Incorrect:**

A. Pityriasis alba is primarily a facial condition affecting children and presents with hypopigmentation, not a scaly macule on the chest.
B. Pityriasis rosea typically presents with a single large scaly patch on the trunk and not the chest.
C. Discoid lupus erythematosus is an autoimmune disease involving the skin, not a fungal infection, and may present with multiple lesions but is not primarily a fungal infection.

**Core Concept:**

Fungal infections, specifically caused by dermatophytes, can affect the skin and present as a scaly macule or plaque, which is why Tinea corporis is the correct answer.

**Clinical Pearl:**

Fungal infections, specifically Tinea corporis, are common in children and involve the chest, back, and upper extremities. Prompt diagnosis and treatment are essential to prevent complications and ensure the health and well-being of the patient.