Q.What is this on my maple tree and is it a problem?
The tree is between 5 and 6 feet tall, is one of three planted at same time approximately 4 years ago. The other two trees are shorter and unaffected at the present. No other tree in immediate area shows this same bark affliction.

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on April 28, 2020
It may be galls as presented in this article:
https://www.gardeningknowhow.com/ornamental/trees/maple/maple-tree-bark-disease.htm
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