The green nail syndrome was first reported by Goldman and Fox in 1944 as a nail pigmentation caused by pseudomonas aeruginosa. The green nail syndrome was caused by infection of the nail. It occurs well in home-housewives, swimmers, and nurses who frequently contact with water, and trauma is also a risk factor. A 14 - year - old man presented with pain due to the first toe - ingrowing toenails. The patient had severe inflammation so underwent partial claw removal and tube insertion. Two days later, the right thumb nail tube was pulled out of the foot. The tube was reinserted and fixed with paper tape. Two weeks later, when the patient revisited, the color of the right toe nail changed to green color. The lesions were dressed and cultured. The patient was given one week of levofloxacin, steroids and antihistamines. In this case, considering the point that occurred after medical treatment and dressing with no water contact history until the patient developed green nail syndrome. Despite the airtight paper tape wrapped around the toenail after the tube insertion. It was thought that the tube insertion procedure and paper tape itself was a cause of trauma and wet condition became a Pseudomonas aeruginosa infection.