Which skin condition involves a hypopigmented rim around the lesions?

The skin condition characterized by a hypopigmented rim around the lesions is erythema multiforme minor. This condition presents with target lesions, which feature a central darker area surrounded by a lighter hypopigmented or pale ring. This distinctive pattern is often referred to as a "target" appearance and is a key clinical hallmark of the condition. Erythema multiforme minor is typically triggered by infections, commonly herpes simplex virus, or certain medications, and it primarily affects young adults.

Other conditions mentioned, such as chronic urticaria, atopic dermatitis, and psoriasis, do not typically exhibit a hypopigmented rim around lesions. Instead, chronic urticaria presents with wheals that are often transient, atopic dermatitis is characterized by dry, scaly patches and not generally rimmed by hypopigmentation, and psoriasis has well-defined red plaques covered with silvery scales, but no hypopigmented borders. Understanding these distinctive signs and presentations is crucial for accurate diagnosis and management of skin conditions.