I have 6 Autumn Blaze Maples in my yard, all younger trees (maybe 5 years old) and all have red bumps on the top of the leaves. I was reading on your website that this is likely Maple Bladder Gall but it mentions this occurs on the underside of the leaf and this is on top. I have attached a picture. Can you tell me what this is and if there is anything I should be doing to address it? Thank you in advance for your help!! Very much appreciated.