blotch
/ˈblɒtʃ/Definitions
1. noun
A patch or spot of discoloration, usually on the skin, often caused by an injury or disease.
“The rash on her face was a large blotch that attracted unwanted attention.”
2. verb
To mark or stain something, especially with a dark or discolored patch.
“The accident left a blotch on the white wall, which was difficult to remove.”