The Presidency will look into the origin of a series of photographs posted on social media that show a young woman kissing a man who appears to be President Jacob Zuma.
The pictures were circulated on social media on Wednesday.
"We will check the matter," Presidency spokesperson Bongani Ngqulunga said.
A 19-year-old woman called Lindokuhle Dlamini posted a series of selfies of herself with the president on Tuesday.
She captioned it: “He is not just a blesser, we are inlove and I am grateful for all that he has done for me, much love. Xo xo."
A blesser, or sugar daddy, is an older man who gives a younger woman money or gifts in exchange for sex.
Her Facebook account has since been deleted.