Would have to see the "dimple" to be able to help you. If in the right location, for example not close to the edge or a crease, you may be able to use a suction type device to pull the dent out. Amazon has some, for example:
ZEUSFIRE 41pcs Paintless Dent Repair Kit, Car Dent Puller Tool with Golden Lifter,Bridge Puller, Suction Cup & Glue Gun for Automobile Body Dent Removal Remover Tools Kit (41PCS)
- This item: LTGABA 32Pcs Auto Body Paintless Dent Removal Tools Kit - Gold Car Dent Puller with Bridge Dent Puller for Car Hail Damage and Door Dings Repair
$30.99 - GLISTON Paintless Dent Repair Glue Sticks Hot Glue Sticks Paintless Dent Repair Tool for Car Repair Dent Remover Tool Set - 10 PCS Black
$9.99