A few days after a summer hiking trip, a 25-year-old man comes to the clinic with a rash. On examination, the nurse notes that the rash is red, macular, with a bull's eye pattern across his midriff and behind his knees. What does the nurse suspect?

A) Eczema
B) Rubeola
C) Lyme disease
D) Medication allergy

Lyme disease occurs in people who spend time outdoors in May through September. The first disease state exhibits the distinctive bull's eye and a red macular or papular rash that radiates from the site of the tick bite with some central clearing. The rash spreads 5 cm or larger, and is usually in the axilla, midriff, inguinal, or behind the knee, with regional lymphadenopathy. Rubeola presents as a red-purple maculopapular blotchy rash that first appears behind the ears and then spreads over the face followed by the neck, trunk, arms and legs. Eczema, or atopic dermatitis, is a chronic inflammatory skin lesion that presents as erythematous papules and vesicles with weeping, oozing, flaking, fissures, crusts, and severe pruritis. An allergic drug allergy often presents with a generalized erythematous and symmetric rash.