The poem is about self-harm, and about the small lies that hide it. The speaker answers every worried question with a quick, flat excuse: the cat, fashion, a bad dream. Those answers are short and rehearsed, and the repeated word "just" tries to shrink something painful into something harmless. The more it is repeated, the less believable it sounds.
The speaker seems caught between wanting to be noticed and being afraid of it. The excuses shut people out, yet the questions are there because someone has seen the marks. Judging by the imagery, the crying and the "scream" suggest a hurt that is much bigger than the cuts themselves.
The last two lines break the pattern. "Just" turns into "just once more," which describes a cycle that feels impossible to stop. The mood is quiet, tense, and heavy, ending on a stark warning that something dismissed as small can become dangerous.