a stain
Your neck has a stain.
Notó una mancha roja en la camisa justo antes de entrar a la entrevista.
He noticed a red stain on his shirt just before going into the interview.
Tienes una mancha en la camisa.
You have a stain on your shirt.
There's a grease stain.
Una mancha de sangre en su dedo.
A blood stain on his finger.
Sólo queda una mancha marrón donde había estado el pájaro.
Only a brown stain remains where the bird had been.
— It's Such a Beautiful Day (2012)
Había una mancha extraña en la pared del cuarto nuevo.
There was a strange stain on the wall of the new room.