Diablo 1 HD Hellfire Mod | Awake

Hi there,

I'm currently up to Level 16 on Normal with my first character (Rogue).

I just realised that I had the Lost Treasure quest, and I opened the map and it showed me the Caves. I went to the Caves and it looked like normal Caves so I thought it wasn't worth exploring.

Anyway, the map is now gone because I used it. Is there a way to get the quest again so I can get the +3 skill points?

You can simply go back into the cave. (It's to the far left past Wirt and the opening to Hell, over a tiny adorable bridge.) Also keep in mind the location will continue to be there even after you've completed the quest; when playing a mage class it becomes one of the most useful areas in the whole game for grinding equipment.