Did men shave their hair in the Heian Period in Japan?

No shaving in the Heian period

That hairstyle is called Tsukiyo (さかやき)

http://www.cosmo.ne.jp/~barber/sakayaki.html

This is a description of the hairstyle and a picture of the hairstyle from the Japanese side, and the kanji characters are always easy to understand

This is the Chinese version

The Tsukiyo (Japanese: さかやき) is a traditional Japanese hairstyle for adult males. All the hair starting from the side of the forehead to the top of the head is shaved, giving the skin a half-moon shape.

The reason for the use of this hairstyle is widely recognized as "to make it easier to put on a helmet in battle," according to Sadaharu Ise, an expert on Edo period etiquette.

According to the early Kamakura period Sekibai Kujo Kanzumi's diary "Tamaha" in the Angen 2, July 8, an entry: "Since the piece of Lianzhong, when Tadachika pointed out the head, his sideburns are not correct, Tsukiyo too see the pain, face is very damaged." It is known that this hairstyle existed at the end of the Heian period.

And Japanese classical literature "Taiheiji" Volume 5 also has: "Kataoka Hachiro Yada Hikokichi took off his turban and put his fingers on the side of his head. The mountain of hair showed traces of the previous Tsukiyo era".

Checking the results of the picture scrolls, it can be determined that the Tsukiyo of the Kamakura and Muromachi eras were mainly used on the battlefields, and that the Sousho hairstyle was used in normal times.

The Tsukiyo became an everyday hairstyle in the Warring States period, and it became customary in the Edo period. It was popular among the commoners and military families, as well as the government officials, and it was the customary hairstyle to be shaved during the genbutsu.

The custom continued until the Meiji era, when it was decreed that the hair should be shaved.