blotch

A blotch is a mark or stain that is irregular in shape and often unsightly. It can be a discolored area on a surface, such as a wall or fabric, or a patch of color on an animal's fur or skin. The term "blotch" is commonly used to describe unintentional marks, unlike a deliberate pattern or design. For example, ink might blotch on damp paper, or paint might create an accidental blotch if applied unevenly.

In the context of art and design, blotches can sometimes be incorporated intentionally to create texture or a specific aesthetic effect, though this is less common than their appearance as errors. The size and intensity of a blotch can vary greatly. A small blotch might be a minor imperfection, while a large blotch can significantly alter the appearance of the surface it covers.

The word "blotch" can also be used figuratively to describe an unattractive or irregular feature. For instance, someone might refer to a poorly constructed building as having a blotch on the landscape. It can also refer to a skin condition characterized by irregular patches of discoloration, such as certain types of acne or rashes. The origin of the word is believed to be related to the sound of something wet and splattering.