speck

A small spot, mark, or discoloration.

A tiny amount; a bit.

To mark with specks.

A very small superficial spot or stain; a small dot, blot, blotch, or patch appearing on or adhering to a surface.

In fruit, specifically, a minute spot denoting the beginning of decay; a pit or spot of rot or rottenness; hence, sometimes, a fruit affected by rot.