Peach leaf issue?

Derek Reese 29

5 year old buck +
Hello All,
Was checking out my parent's peach trees that are on the farm I hunt and came across some weird growths on about 1/3 of the leaves. This tree was planted 4-5 years ago and is in zone 5 (Northern PA).
Any help in identifying the issues and also on how to treat it would be great.
Thanks for your help!IMG_4060[1].JPG
 
Our five year old peach tree gets exact same thing every spring but only on a few of the leaves.
Good info
 
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