noun, feminine/ˈlakɾa/plural: lacras
lacra is feminine in Spanish.
scar, trace; fault, bane; blot
“El Procés es la gran lacra que ha fagocitado todos los problemas de los catalanes.”
Probably from lacre (“sealing wax, resin”), referring to the scars left over after being lashed. Compare Asturian llácara.