blotch
US /blɑːtʃ/
UK /blɑːtʃ/

1.
macchia, chiazzo
an irregular patch or spot of color or discoloration
:
•
He had a red blotch on his arm after touching the plant.
Aveva una macchia rossa sul braccio dopo aver toccato la pianta.
•
The old painting had several dark blotches.
Il vecchio dipinto aveva diverse macchie scure.