Acute Care Nurse Practitioner Exam Prep 2025 – Complete Practice Resource

The target configuration, often referred to as the "iris," is characterized by concentric rings or layers that resemble the appearance of the human iris. This pattern typically manifests in certain dermatological conditions, such as erythema multiforme. It presents itself as a central area surrounded by a darker ring and then a lighter outer ring, effectively mimicking the structure of the iris where the pupil is surrounded by the colored part and bordered by the sclera.

Understanding this configuration is essential in recognizing specific skin lesions or reactions that are critical in differential diagnoses. The distinct and layered appearance can help clinicians assess and manage conditions appropriately. In contrast, annular lesions typically form ring-like structures but lack the concentric detail seen in the target configuration. Comedones are simply clogged hair follicles, and folliculitis is characterized by inflammation of the hair follicles, which does not involve any distinct ring-like patterns. Thus, the target configuration is unique in its resemblance to the iris, reinforcing the importance of visual diagnosis in clinical practice.