inside wall repair

You don't say what the construction of the unit is - wood frame with aluminum siding or aluminum frame with fiberglass. If a wood frame, a "soft spot" usually indicates rot from water incursion and entails MUCH more than just repairing a small spot. To do it right, the inner and/or out panel(s) need to be removed and the framing replaced - and figuring out how the water got in in the first place.

Rob

aluminum frame, and yes the leak is fixed.

Do you have a nice RVing picture that could be hung over the spot?

nope ,, nice idea

Then your best looking option is to remove the portion of the wall, throroughly dry or replace the insulation replace the wall board with something similar and paint. Remember, once its wet mold can set in quickly. So you need to get the wall opened up and let it dry completely. If this is on an outside wall, and depending on construction it could also involve the siding underlaymant.

depending on where it is build a shadow box or storage shelf

Figure out the studs with a stud finder, then put a decorative routered piece of fancy plywood from stud to stud. A handy place to put somethings. Keys, phones, empty pockets, maps, electronics.

all great ideas but the damage is closer to the floor.

How big is 'small'? Cut the minimum opening required to check for damage to the backside of the exterior skin and with a mirror check the backside of the interior panel around the opening. What you find will dictate repairs needed. Then if the opening is small enough, then hide it with a fake outlet or battery operated motion activated nightlight. If it is larger, make a fake access panel that you can always use to check for repeat leaks.

Thin layer of luan? You can paint or wallpaper the area.