Get a heat gun and put it on half heat. 
1500w approx. 
Hold it as least 12" away and imagine you are spraying a car. 
Have a clean rag to hand and every 20 seconds smooth over the area of the dimples applying moderate pressure. 
soon the leather around the dimples will stretch, thus removing the dimples. 
I have been using this meathod with success for quite a while. 
Do not be tempted to rush the job or concentrate the heat for to long over the same area. 
If you don't have a heat gun then pinch the misses hair dryer.