A man wearing sunglasses was spotted flashing in Clapham.
Police received several calls from members of the public about a man exposing himself at the top of Milton Road just before 3pm on Friday (March 20).
He is described as white, about 6ft tall, in his late teens or early 20s with light brown hair. At the time he was wearing black jeans, a black top, a leather jacket and sunglasses.
Anyone with information can call PC Chris Barker on 101, text 07786 200011 or call Crimestoppers, anonymously, on 0800 555111