Canary Island Date Palm Trunk Problem

Question: Please help, I have a seven year old palm approx, 20′ tall that over the last few months has developed a light spiral flakiness/dry area starting about 4′ from the base and circling the trunk upward for about 2′. The dryness, cause the area of the trunk to lightly flake off. In the beginning I thought the first area of concern was caused by the tree maintenance company ladder being leaned against the trunk, and then I noticed the same appearance spiraling up the trunk. No one can identify what this problem could be. There are NO growths on the trunk, it appears to be more of a disintegrating of the bark. Thank you for any knowledge of a problem of this kind.

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