**Core Concept**
Childhood alopecia with scalp swelling is often associated with a condition that affects the scalp and hair follicles, leading to hair loss and inflammation. This condition is a form of autoimmune disorder that affects the scalp and hair follicles.

**Why the Correct Answer is Right**
The condition described in the question is likely **tinea capitis**, also known as ringworm of the scalp. Tinea capitis is a fungal infection that affects the hair follicles on the scalp, leading to hair loss and inflammation. The infection is caused by dermatophytes, such as Trichophyton, Microsporum, and Epidermophyton species. These fungi infect the hair shaft, causing it to break off at the surface of the scalp, leading to hair loss and inflammation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not describe the condition associated with scalp swelling and alopecia in a child. While eczema can cause skin inflammation and hair loss, it is not the primary condition associated with scalp swelling and alopecia in children.

**Option B:** This option is incorrect because it does not accurately describe the condition associated with scalp swelling and alopecia in a child. While seborrheic dermatitis can cause scalp inflammation and hair loss, it is not the primary condition associated with scalp swelling and alopecia in children.

**Option C:** This option is incorrect because it does not accurately describe the condition associated with scalp swelling and alopecia in a child. While psoriasis can cause scalp inflammation and hair loss, it is not the primary condition associated with scalp swelling and alopecia in children.

**Clinical Pearl / High-Yield Fact**
Tinea capitis is often associated with a black dot appearance of the scalp due to the presence of broken-off hair shafts. This appearance is a classic sign of tinea capitis and should be considered in the differential diagnosis of childhood alopecia with scalp swelling.

**Correct Answer:** A.