Arañazos literally translates to 'scratches' or 'claw marks'. It is a striking and highly visual word that stands out because it is rarely used in typical pop songs.
In these lyrics, Jeanette uses it metaphorically when she sings about "arañazos en el corazón" (scratches on the heart). This creates a vivid, passionate image of emotional pain that perfectly matches her comparing herself to a wounded panther (pantera herida) earlier in the song.
This song is a powerful declaration of not giving up on a lost love. Jeanette describes herself as a "pantera herida" (wounded panther) who refuses to surrender, even though she feels like she has "arañazos en el corazón" (scratches on the heart). She is completely devoted to finding the person who has left her.
The search she describes is almost supernatural. She promises, "pondré mis ojos en el sol, buscándote" (I will put my eyes on the sun, looking for you), a painful and impossible act that shows her desperation. She hears "voces en el mar, llamándote" (voices in the sea, calling you) and sees the rain as "lágrimas del cielo, llorándote" (tears from the sky, crying for you). It's as if the entire world is joining her in her search, fueled by the belief that she has nothing left to lose.