In some cases, imperfect apples still prove safe for consumption. Indentations and small bruises on and under the skin of the apple are not generally harmful, and you can simply cut away the damaged area and consume the rest. Rotting apples, with brown lesions or mushy spots throughout, however, should be discarded.
Also know, are unripe apples bad for you?
Eating Apples That Aren't Ripe. Apples are the second-most popular fruit in the United States. From baked goods to cocktail garnishes and home decor, the apple figures prominently in American culture and cuisine. Apples are also best when eaten ripe; unripe apples are not dangerous, but they sour and become hard.
Is it bad to eat a bad apple?
Apples are delicious and very good for you, but eating one that has mold or is rotten can make you sick. Sometimes, it is hard to tell whether an apple is just bruised and still safe to eat or whether the apple is rotten and needs to be thrown away.
How can you tell if an avocado is bad?
Cut open the avocado with a knife. If it's dark green near the skin and pale green near the stone, it's ripe. But if the meat is separated, stringy, and brown or black, it's rotten. If the meat of a ripe avocado is exposed to air, it'll brown quickly, but you can skim off the top layer and still use the avocado.