Soft, mushy, or wrinkled texture
Sprouting eyes or long sprouts
Green skin or green patches
Mold, fuzz, or dark spots
Bad smell, sour smell, or musty odor
Leakage, wetness, or slime
Large cuts, bruises, or damaged skin with decay
Hollow, shriveled, or dried-out interior
Bitter taste after cooking
Discoloration spreading beyond the skin