The anonymous artist left the painting at Southampton General Hospital in Southhampton, United Kingdom, some 70 miles southwest of London.
The picture depicts a boy holding a nurse doll wearing a robe and he has dumped Batman and Spiderman toys in a trash can.
Banksy uses black and white for the whole picture except for the red cross on the nurse’s uniform.
The hospital said it planned to keep the painting during the summer before auctioning it.
The results will benefit the British public funded National Health Service.
Banksy is mainly known for his socially and politically relevant art that was painted in public places. Some of his works have been sold for hundreds of thousands of dollars with some worth millions.
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