The appearance of an unexplained scar on Russian President Vladimir Putin's neck has reignited concerns about his health, with some speculating the leader may be suffering from thyroid cancer, according to RadarOnline.com.

The 70-year-old leader was photographed in Moscow on Sunday with a noticeable "Z"-shaped scar above the collar of his suit, adding to ongoing rumors about his health. The images were released as Putin celebrated the Orthodox Easter holiday over the weekend, with the Kremlin remaining silent about the origin of the scar.

One observer on Telegram commented, "A strange scar in the shape of the letter 'Z' has been noticed on Putin's neck. The unusual shots were taken on Easter when the dictator visited a cathedral."

As previously reported by RadarOnline.com, the sighting of the scar comes after revelations that Putin is often accompanied by a doctor specializing in thyroid cancer. Dr. Yevgeny Selivanov is said to have treated the Russian leader over 35 times in the past year using steroids, a treatment some sources believe may have contributed to Putin's erratic behavior prior to ordering the invasion of Ukraine in February 2022.

Independent Russian media outlet Proekt stated last year, "We promised to reveal to you the main secret of the Kremlin. Of course, we are talking about the health of Vladimir Putin." The outlet added that Putin has shown public interest in thyroid cancer and that there have been conversations in medical circles about his health issues.

The scar's appearance also follows the leak of classified Pentagon documents, which suggested that two Kremlin officials planned to undermine Russia's war efforts in Ukraine while Putin was receiving cancer treatment. The officials allegedly intended to "divert resources from Taganrog, Russia to Mariupol, Ukraine" while the Russian leader was incapacitated.

The leaked documents claimed that General Valery Gerasimov, Chief of the General Staff of the Armed Forces of Russia, planned to sabotage the offensive and "throw" the military operation by March 5, when Putin was rumored to be starting a round of chemotherapy and would be unable to influence the war effort.