If you run into any unlit candles in Animal Well, then this guide at Seeking Tech will explain how you can light them up.
In order to light an unlit candle, you will need to find a match. These special items are located inside of chests hidden throughout the map.
The earliest you can find this item is to the left area of the very first save telephone.
Once you get past the unlocked door, jump up the hidden platform in the same area in order to find a chest with the item.
The first unlit candle you run into is located to the right side of the first save telephone in the game. You have to climb a ladder to the next screen and then look for a hidden area that will let you drop down to the candle.
If you have a match in your inventory, then you can interact with an unlit candle to light it up.