It's hard to say what's going on, but my bet is that because of the wet conditions that your mulch is sprouting some form of mushroom/fungal growth. If the plant looks healthy, but the area around it looks odd, I bet it's the mulch that's forming these growths. I'd rake away the mulch to see if you can see if these bumps are attached or from the soil underneath. These should go away once the weather gets hot and dry. If, they are growing right on the plant itself, that's another matter. Repost if you think the plants themselves are ill with more specific information about how the plants look."
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