anyone have any tips on healing scars?

Mary
Ok I know that <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> isn't really for this, but Idk who else to ask. I was self-harming throughout dec and feb and have a vacation to FL in a couple weeks. I'm terrified to wear short sleeves. My cuts have healed but the scars are noticeable. Any tips? I'm desperate.