I have been reading the questions on the zucchini bumps, but the answers are always about while they are growing. Some of mine has been getting bumps AFTER I refrigerate them. They look beautiful when I pick them. I rinse them and put them in the fridge. The next day some will have weird little bumps.
A bad zucchini squash is easily identifiable as the skin appears dull and lifeless. Do not eat a zucchini if it is covered with rotten spots or decay. The vegetable may feel mushy, and the skin may be wrinkled or shriveled. If you cut into a bad zucchini, the inner flesh may be stringy and filled with large seeds. Zucchini goes bad once it has exceeded its shelf life or if it is stored improperly.