"@johnnydangandco you're the greatest in the game everyone needs to know and they will after THIS PIECE," Aaron captioned a mirror selfie of his new ink.
"I'M THE BIGGEST THING IN MUSIC RIGHT NOW," he added in another pic. "I CANT BE DENIED. FACT CHECK ME."
The "I Want Candy" singer's tattoo appears to be of a woman who looks similar to the Greek goddess Medusa.
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Aaron seemingly received backlash over the tattoo as he took to Twitter to defend his mental state. The tweets come after fans and family alike have voiced their concerns over Aaron's health as of late.
"I'm doing just fine," he tweeted. "I ask you repent my and leave me alone. I already have to move and I don't need to be under scrutiny with every decision I make. I will take the necessary precautions to protect myself, and when I move no one will know where I live! #MissingMyMom right now."
The pop star also filmed the police coming to his house again for a welfare check on Instagram Live. Aaron seemed to allude to the situation when he called out a fan on Twitter.
"Bruh stfu all y'all bully's [sic] cyber bullying me," he wrote. "All my fans #LMG #AcArmy look T my teeets [sic] and report these people #CyberBullying is against the law. So is the constant harassment calling the police on me ten times a f--king day!!"
Aaron's social media posts come just a couple weeks after his brother, "Backstreet Boys" singer Nick Carter and their sister, Angel, both filed restraining orders against him.
"In light of Aaron's increasingly alarming behavior and his recent confession that he harbors thoughts and intentions of killing my pregnant wife and unborn child, we were left with no choice but to take every measure possible to protect ourselves and our family," Nick tweeted. The singer also claimed Aaron hears "voices in his head."
Aaron denied those claims, with his rep telling TMZ, "I am astounded at the accusations being made against me and I do not wish harm to anyone, especially my family."
As part of the restraining order, Nick said Aaron told their sister Angel, "I have thoughts of killing babies," and that he has also considered "killing Nick's pregnant wife, Lauren Kitt." The order further claimed that Aaron told Angel, "I was diagnosed with schizophrenia and bipolar 2 years ago."
I'm doing just fine. I ask you repent my and leave me alone. I already have to move and I don't need to be under scrutiny with every decision I make. I will take the necessary precautions to protect myself, and when I move no one will know where I live! #MissingMyMom right now.
Bruh stfu all y'all bully's cyber bullying me. All my fans #LMG #AcArmy look T my teeets and report these people #CyberBullying is against the law. So is the constant harassment calling the police on me ten times a fucking day!! https://t.co/93pEv2iA1I
Aaron also recently accused his late sister Leslie Carter of sexually abusing him as a child over a span of three years, and that Nick abused him as well.
Earlier this month, Aaron was on an episode of "The Doctors" where he said, "The official diagnosis is that I suffer from multiple personality disorder, schizophrenia, acute anxiety; I'm manic depressive."
The star also spoke about the ongoing beef with his brother and accused Backstreet Boys fans of cyberbullying.