Kelsy Karter, a big fan of the former One Direction star, shared pictures of the provocative artwork on Instagram.
The 24-year-old, a recording artist based in LA, has long said she is desperate to work with Styles - and the tattoo could well be an attempt to grab his attention.
One photograph on Karter's profile shows the artwork on her reddened cheek, along with the caption: "mama, look what i made me do."
Another image shows her along with tattoo artist Roman Lacoste.
Whether real or fake, the post is her most-liked to date - amassing more than 31,000 likes at the time of writing.
The tattoo recreates a promotional shot taken for Styles' eponymous 2017 album, where the singer posed with wet hair while wearing a blue velvet suit.
Reaction on Instagram tended to be one of shock - with many hoping the tattoo was temporary.
One person wrote: "Whoa. I hope that is fake."
Another user commented: "I hope that ain't real, your face looks so beautiful naturally".
Someone else said: "I love lots of actors and actresses but I wouldn't get a tattoo of them on my face…"
Earlier this month, Karter hinted at the tattoo in a tweet when she wrote: "Finally know what I'm getting Harry for his birthday."
She has spoken of her admiration of Styles in the past, telling i-D in 2017 that she feels like "a female version" of him.
Karter said: "For someone like me who wants to live in that world who hasn't been in a boy band, he has opened the door for me. He's introduced the kids to the kind of music I want to make.
"I really want to work with him. Let's work, Harry. Where you at? Mark my words: I'm getting a song on his album."