The correct answer is: D. Contact dermatitis.

This periumbilical eczematous eruption is classic for allergic contact dermatitis secondary to nickel exposure. The metal snaps on the pants are the cause of the nickel exposure in this case.

The remaining answer choices are less likely, especially given that the image shows a well-demarcated eczematous periumbilical eruption and metal snaps suggesting a contact nickel allergy.

References:

PMID: 26172492

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