Derm Dx: Is this Lyme disease?

A 20-year-old college student presents with a rash on her flank, which she first noticed approximately 2 weeks ago. The rash was bright red initially but has faded in color over the past several days. She is an avid hiker but denies antecedent tick bite at the site. However, several weeks ago, she removed a tick from her scalp. One ...