**Core Concept**
Tinea manuum is a superficial fungal infection of the hand, caused by dermatophytes such as Trichophyton rubrum and Epidermophyton floccosum. It typically affects the palmar surface of the hand, leading to symptoms like erythema, scaling, and fissuring.

**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of tinea manuum. The infection occurs when the dermatophytes invade the keratinized layers of the epidermis, causing damage to the skin's barrier function. This leads to the characteristic symptoms of the disease, including scaling, fissuring, and erythema. The infection can spread to other parts of the body, including the feet, through direct contact.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct location of tinea manuum. While the hand is affected, the specific area of the hand, such as the palmar surface, is crucial for diagnosis.
**Option B:** This option is incorrect because it does not mention the causative agents of tinea manuum. Dermatophytes like Trichophyton rubrum and Epidermophyton floccosum are the primary causes of this infection.
**Option C:** This option is incorrect because it does not describe the typical symptoms of tinea manuum. While erythema and scaling are common, the specific symptom of fissuring is characteristic of this infection.

**Clinical Pearl / High-Yield Fact**
Tinea manuum can be distinguished from other hand infections, such as eczema or psoriasis, by its characteristic distribution on the palmar surface of the hand and the presence of scaling and fissuring.

**Correct Answer:** D.