The colorless tattoo shows a woman with lips covered in stitches, a black eye and bruises on her face - suspiciously comparable to the 2009 photos of a beaten Rihanna that were leaked to TMZ.
Brown was convicted of felonious assault and strapped with a restraining order that was later dropped in 2011.
The singer's representative is denying that the woman on his neck has any relation to his ex-girlfriend.
"His tattoo is a sugar skull - associated with the Mexican celebration of the Day of the Dead - and a MAC cosmetics design he saw," the rep said. "It is not Rihanna or an abused woman as erroneously reported."
Brown himself took to Twitter saying, "I'm an artist and this is art. Dia de los Muertos."
After the slamming reports that his neck tattoo resembles Rihanna's face, Brown took to Instagram to show off more ink he'd recently gotten, again putting him alongside his ex-girlfriend.
The tattoo is a fighter jet at the top of his stomach and was appropriately captioned "Fly."
Rihanna also recently got a tattoo that incorporated wings, a goddess, near the same place as Brown's, right above her rib cage.
The singer revealed her "under-boob" tattoo on Instagram on Sept. 9.
"Goddess Isis - Complete Woman - Model for future generations- #GRANGRANDOLLY - always in and on my heart #1lo," tweeted Rihanna, a tribute for her late grandmother.
The tattoo gossip adds to recent assumptions that Rihanna and Brown are well on their way to getting back together.
Rihanna recently appeared on OWN for a sit-down conversation with Oprah, where she stated she still loves him.
"We've been working on our friendship again. Now we are very, very close friends. We built a trust again," Rihanna said. "We love each other, and we probably always will, and that is not anything that we are going to try to change. That is not something you can shut off if you are ever in love.
"And the main thing for me is that he is at peace. I'm not at peace if he is unhappy or he is still lonely. I care. It actually matters that he finds peace."
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