A man with a face covering exposed himself to a woman in Horfield.
She was walking down Toronto Road when the incident happened at around 11.30pm on April 22.
He is described as a man of large build, wearing a grey jacket. His face was covered with a balaclava or mask.
Avon and Somerset Constabulary is now appealing for anyone who was in the area at the time to come forward.
A police spokesperson said: "We’re appealing for witnesses following an indecent exposure incident in Horfield.
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"We’re keen to hear from anyone who was in the area at the time of the incident who may have information to help us.
"If you have any information which could help, please contact us through www.avonandsomerset.police.uk/contact , or by calling 101, quoting reference 5219087038
"Alternatively, you can contact Crimestoppers anonymously on 0800 555111 or report it on-line using the following link bit.ly/1pwX4Zm quoting the above reference number."
