Police are looking for a man suspected of exposing himself near the former Johnson Hospital in Spalding.
A woman was walking along Priory Road when she saw a man who committed an act of indecent exposure at about 5pm on Sunday, February 28.
The man is described as being of chubby build, 30 to 40 years old, bald and clean shaven.
He was wearing a black or grey-coloured tracksuit.
Anyone with information or who has a man matching the description in the area of Priory Road should call PC 309 Putman on 101, quoting incident number 244 of February 29.