They're considered as eriophyid mites, these blister mites are tiny, microscopic pests that can cause big problems when they are allowed to get out of control. The most common types of blister mite pests are pearleaf blister mite and appleleaf blister mite. They enter the tree in late summer or early fall, overwintering until spring when they become active and feed on tender leaf tissue, specially when the weather is cool. The good news is that blister mite pests are slow moving and often affect only a single fruit tree or even a single branch, while the bad news is that once you notice signs of blister mite damage, it is usually too late to do much about it.

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Source: Gardening Know How