Brucellosis is a zoonotic disease with high prevalence in the Middle Eastern countries. Psoas abscess is a rare complication of Brucellosis. A combination of antibiotic therapy and drainage is the recommended management. We present a 14-year-old male patient with this complication. He was treated with oral antibiotic without drainage.

We report a four-month-old girl with a right thigh swelling, an eight-month-old girl with a left thigh swelling, and a five-month-old boy with a left thigh swelling with the final diagnosis of BCG-induced cold abscess as a result of erroneous injection of BCG vaccine into the infants' thigh muscle.