A 55-year-old female patient with seronegative rheumatoid arthritis (RA) was admitted as an inpatient due to atraumatic, treatment-refractory, and immobilizing bilateral lower extremity pain.

While her abdominal symptoms mildly improved with ustekinumab, she developed new bilateral lower extremity rash initially treated with levofloxacin for presumed cellulitis. The rash consisted of ...