This is the 5311th most frequent Spanish word.
lacra
A blemish, scourge, or harmful defect affecting someone or society.
Here, 'lacra' is used to refer to a negative aspect or corruption that has a deteriorating effect on society.
Es una lacra social que afecta a nuestra comunidad.
It is a social scourge that affects our community.
In this case, 'lacra' describes a hindrance or drawback that impedes improvement or progress.
Esa actitud es una lacra para su desarrollo personal.
That attitude is a flaw for their personal development.
Here, 'lacra' is used metaphorically to denote an issue embedded within a system that needs to be addressed and eliminated.