Lincolnshire Police are appealing for witnesses and information after an assault on Outer Circle Road in the summer.
A 32-year-old man was walking near to Charles Warner car sales at around 4pm on Wednesday, August 12 when he reported being approached and assaulted by another man. He was not seriously injured.
The offender is described as being a white male, of stocky build, with black hair and facial stubble.
He was wearing a blue top and black trousers.
Investigating officers would like to hear from anyone who may have witnessed the assault or anyone who has any information that may assist the enquiry.
Anyone with any information is asked to contact Lincolnshire Police on 101 quoting incident 292 of August 12.
Alternatively contact the independent charity Crimestoppers anonymously on 0800 555 111.