Hiding cuts on arms and legs?

I have prom this weekend, and I just got outta self harm a bit ago. (I'm done now, i dont need to be told I need help, i got help and im ok) But how do you hide them? in school im use to wearing clothes that hide them, but now i have a stapless dress.. theres some on my wrist and upper arm by shoulder. the ones on my legs wil be fine (since my dress is long) but how do you hide them? i know coverup doesnt work that well...