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I found this source but i don't know whether it is what you are after.

Thranduil’s sudden scars reflect a little emphasized of Tolkien’s lore: elves’ “Fëar” (a metaphysical concept analogous translatable as “soul”) occasionally influences the “Hröa” (the fleshly, physical body), particularly under moments of extreme stress. This can manifest as extreme physical changes that reflect the mind’s state, in this case deep war scars.

Source

Edit : I have also found this reference which seems to state that Tolkien made no reference to the Scars on Thranduil's face in the books.

Thranduil's scars are decidedly non-canon. According to Tolkien's texts, the last battle Thranduil saw (up to setting in The Hobbit) was that of the last alliance at the end of The Second Age. However, in the 1900's of the Third Age, according to text, the "serpents of the north" were fought and mostly slain. In all likelihood, Peter Jackson is taking creative liberty with the story. On a more symbolic note, the scars could represent the pain Thranduil has endured in war (he watched his father die in the battle of the last alliance).

Source

I found this source but I don't know whether it is what you are after.

Thranduil’s sudden scars reflect a little emphasized of Tolkien’s lore: elves’ “Fëar” (a metaphysical concept analogous translatable as “soul”) occasionally influences the “Hröa” (the fleshly, physical body), particularly under moments of extreme stress. This can manifest as extreme physical changes that reflect the mind’s state, in this case deep war scars.

Source

I have also found this reference which seems to state that Tolkien made no reference to the Scars on Thranduil's face in the books.

Thranduil's scars are decidedly non-canon. According to Tolkien's texts, the last battle Thranduil saw (up to setting in The Hobbit) was that of the last alliance at the end of The Second Age. However, in the 1900's of the Third Age, according to text, the "serpents of the north" were fought and mostly slain. In all likelihood, Peter Jackson is taking creative liberty with the story. On a more symbolic note, the scars could represent the pain Thranduil has endured in war (he watched his father die in the battle of the last alliance).

Source

I found this source but i don't know whether it is what you are after.

Thrandiul’s sudden scars reflect a little emphasized of Tolkien’s lore: elves’ “Fëar” (a metaphysical concept analogous translatable as “soul”) occasionally influences the “Hröa” (the fleshly, physical body), particularly under moments of extreme stress. This can manifest as extreme physical changes that reflect the mind’s state, in this case deep war scars.

Source

Edit : I have also found this reference which seems to state that Tolkien made no reference to the Scars on Thralduin's face in the books.

Thranduil's scars are decidedly non-canon. According to Tolkien's texts, the last battle Thranduil saw (up to setting in The Hobbit) was that of the last alliance at the end of The Second Age. However, in the 1900's of the Third Age, according to text, the "serpents of the north" were fought and mostly slain. In all likelihood, Peter Jackson is taking creative liberty with the story. On a more symbolic note, the scars could represent the pain Thranduil has endured in war (he watched his father die in the battle of the last alliance).

Source

I found this source but i don't know whether it is what you are after.

Thranduil’s sudden scars reflect a little emphasized of Tolkien’s lore: elves’ “Fëar” (a metaphysical concept analogous translatable as “soul”) occasionally influences the “Hröa” (the fleshly, physical body), particularly under moments of extreme stress. This can manifest as extreme physical changes that reflect the mind’s state, in this case deep war scars.

Source

Edit : I have also found this reference which seems to state that Tolkien made no reference to the Scars on Thranduil's face in the books.

Thranduil's scars are decidedly non-canon. According to Tolkien's texts, the last battle Thranduil saw (up to setting in The Hobbit) was that of the last alliance at the end of The Second Age. However, in the 1900's of the Third Age, according to text, the "serpents of the north" were fought and mostly slain. In all likelihood, Peter Jackson is taking creative liberty with the story. On a more symbolic note, the scars could represent the pain Thranduil has endured in war (he watched his father die in the battle of the last alliance).

Source

I found this source but i don't know whether it is what you are after.

Thrandiul’s sudden scars reflect a little emphasized of Tolkien’s lore: elves’ “Fëar” (a metaphysical concept analogous translatable as “soul”) occasionally influences the “Hröa” (the fleshly, physical body), particularly under moments of extreme stress. This can manifest as extreme physical changes that reflect the mind’s state, in this case deep war scars.

Source

I found this source but i don't know whether it is what you are after.

Thrandiul’s sudden scars reflect a little emphasized of Tolkien’s lore: elves’ “Fëar” (a metaphysical concept analogous translatable as “soul”) occasionally influences the “Hröa” (the fleshly, physical body), particularly under moments of extreme stress. This can manifest as extreme physical changes that reflect the mind’s state, in this case deep war scars.

Source

Edit : I have also found this reference which seems to state that Tolkien made no reference to the Scars on Thralduin's face in the books.

Thranduil's scars are decidedly non-canon. According to Tolkien's texts, the last battle Thranduil saw (up to setting in The Hobbit) was that of the last alliance at the end of The Second Age. However, in the 1900's of the Third Age, according to text, the "serpents of the north" were fought and mostly slain. In all likelihood, Peter Jackson is taking creative liberty with the story. On a more symbolic note, the scars could represent the pain Thranduil has endured in war (he watched his father die in the battle of the last alliance).

Source