Have a google... 'Acoustic Guitar, soldering iron, steaming, dent'
If the wood fibers are compressed, you can steam em out - damp rag, and soldering iron or iron
I had a dent in the fretboard, steamed it out a bit, not a fix but an improvement...
Small area so i used a wet cotton bud on the dent, then applied the soldering iron tip to it...
Keep wetting... keep steaming... keep looking