Missing Lily Asinde, 16, from Brighton, has not been seen since Monday evening (February 4) and there is growing concern for her safety and welfare, according to police.
Sussex Police said Lily was last seen at her home in the city around 7.30pm when she went out and was expected back around 10pm.
A police spokesman said: “She is black, 5ft 10in, of large build, with black hair and black and blue plaited extensions.
“When she went out, she was wearing a green jacket, black top, red scarf, black leggings, black trainers and carrying a leather bag, which may have contained a change of clothing.”
Anyone who sees her or who knows of her whereabouts is asked to report online or call 101 quoting serial 1252 of 04/02.