What you have is a SLAP Tear (Superior Labrum Anterior to Posterior tear).
It is quite a notorious type of lesion which usually doesn't heal spontaneously and many patients require arthroscopic surgery
for it. Physiotherapy
alone does not help.
The dent which you notice is probably due to muscle wasting caused by less use of the affected limb.
It is a matter of concern and I would suggest you to consult an arthroscopic surgeon in your area before the tear increases in size.
Delaying the inevitable will only do more harm.
I hope my advice has helped.