Acomplejas comes from the reflexive verb acomplejarse, which means 'to develop an inferiority complex' or 'to feel deeply insecure' about something. It's a powerful word that describes a feeling much deeper than just being shy or sad.
In the song, Prince Royce sings "que te acomplejas de tu imagen" (that you feel insecure about your image). He uses this word to directly address the listener's self-doubt, making his message of self-love and acceptance in the chorus even more impactful.
Corazón Sin Cara (Heart Without a Face) is Prince Royce’s ultimate Bachata love letter about looking past physical appearance. The core message is sweet, direct, and wonderfully simple: love lives in the soul, not in the mirror. Royce hears that the girl he likes feels insecure about how she looks ("te acomplejas de tu imagen" [you feel insecure about your image]). He jumps straight in to reassure her that she looks great without makeup ("sin maquillaje"), and whether she is chubby or skinny ("gorda o flaca"), or light-skinned or dark-skinned ("blanquita, morenita"), none of that matters to him at all.
He takes the pressure off by admitting his own flaws too. Royce sings that he is far from perfect, joking that even with a handsome face, he still deals with his own insecurities ("Aunque tenga cara de bonito me acomplejo yo también" [Even though I have a pretty face, I get insecure too]). The phrase "el corazón no tiene cara" [the heart has no face] carries the whole track, reminding her that true love does not care about exterior looks. He even tells her to light a candle and ask for forgiveness ("Prende una vela / Pide perdón") simply for thinking she was ugly in the first place!