A 62 year old man visited us for pulsating protrusion with 1x1.1cm size on R. temporal area. He had taken 4mmpunch biopsy on same area under the suspicion of verruca vulgaris 2 weeks ago. In past medical history, he was being treated with Rt. cerebral infarction with warfarin and aspirin. Hematoma was suspected and we decided to wait until it subsides. However, the lesion persisted after 4months, and we performed ultrasonography. It showed mixed-echoic subcutaneous lumen with fistula. Pseudoaneurysm on superficial temporal artery branch was clinically suspected and we planned to incise and ligate the artery. However, the patient wanted close observation and it became pulseless and began to flatten after 5months. The lesion spontaneously subsided and nofurther recurrence is seen to this day. Although uncommon, vascular complications may occur after punch biopsy. These include post-biopsy bleeding, hematoma and rarely pseudoaneurysm. Pseudoaneurysm is well-known sequela of iatrogenic injury and consists of an organized hematoma that communicates with the injured artery via a sinus tract. Suture ligation of the implicated artery is considered the treatment of choice. Here, we report a case of pseudoaneurysm occurred after punch biopsy on forehead with spontaneous remission for educational meaning, and dermatologists should keep in mind that this rare complication can be encountered even by small punch biopsy.