Tanjiro’s scar has grown subtly throughout the series without any particular explanation. Tanjiro’s scar is a major plot point in the story that is gradually revealed over the course of the manga. The scar has raised questions regarding its accessibility, power, and contribution to the plot.
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Why did Tanjiro’s scar change?

In the anime, Tanjiro’s scar has three notable forms while in the manga it also has a fourth form. By tracing the scar’s growth trajectory, it’s possible to determine that the scar evolves once the user releases a certain power or upgrades it by growing stronger. There may also be a fairly obvious theory that the scar is the birthmark of someone who uses the breath of the sun.
Various forms of Tanjiro’s scar
At first, Tanjiro’s scar looked like a patch that later grew into a red flame-like patch that spread across his forehead. The scar doesn’t seem to have any mystical background as Tanjiro claims that it was the result of an injury suffered while saving his brother from fire. However, as far as is known, the scar is not simply that. Four distinguishable forms of scarring can be observed in the following events:
At the beginning of the story, Tanjiro’s scar is a patch of frayed skin.
This skin has a jagged appearance in the form of a moon on its forehead after the fight with the Devil.
It was during Tanjiro’s fight with Rui that the evolution of the scar became apparent. The scar looks like the mark of a red flame.
Finally, in the manga, Tanjiro awakens his demon hunter mark in his fight against Daki. This demon slaying crest extends longer on his face.
With the information in hand, there are several factors that can be attributed to this phenomenon:
Awaken the power

By tracing the scar’s growth trajectory, it’s possible to determine that the scar evolves once the user releases a certain power or upgrades it by growing stronger. Tanjiro unlocks the second form while using the Breath of Water and the third form while using the Dance of the Fire God.
The Sun Breath User’s Demon Slayer Seal
Tosuro Rengoku believes that Tanjiro is a user of the breath of the sun after noticing his scar. It could be quite theoretical that the scar was a demon-slaying mark of the Breath of the Sun user. This theory complements the fact that scarring is not a known phenomenon. This may be because Breath of the Sun users are almost extinct.
Ability to obtain the Mark of Demon Slayer

Later in the manga, Muichiro and Mitsuri begin to develop similar marks on their faces while facing the Eternal Moon Demon. The state of Muichiro’s body as he develops the mark provides a great insight into its aspects. Muichiro claimed that he had pushed his body to the limit that his heart rate had increased exponentially and his body temperature had spiked beyond normal.
Purpose
The demon-slaying marks on Muichiro and Mitsuri’s faces have expanded knowledge of the marks and their place in history. It was revealed that the demon slayers who were one step away from Muzan were linked by one aspect: a mark. She further explained that Demon Slayer was developed by demon hunters by unlocking their own potential or reaching a certain peak level. It can be surmised that Tanjiro’s scar resonates with other demon hunters and gives them access to develop such a scar.
What does the Demon Slayer signify?
The Demon Slayer is a symbol of demon hunters who have reached their peak potential in controlling their powers. Tanjiro’s scar is slightly different from the demon slaying seal developed by other demon hunters as it is an initial mark (which can be used by the user of the Breath of the Sun) that can unlock a demon. certain path for other demon hunters.
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