[OccumCymn]

Salaam Aleikum.

Well a mark on forehead i wouldnt say automatically mean the brother or sister is a momin, as obviously they would have to be a practicing believer to evelavate to a certain spiritual level and the mark on the forehead would be an added benefit.

A mark could occur simply of ones sensitive skin, and could just pray once in a while.

Otheres could genuinly have the mark due to alot of prayers.

If you add up the daily fardh prayers (five) plus the nawafil prayers , if someone prayed this everyday , it could potentially result in this sign.

Shias have to prostrate on earth which is a much harder surface (as most will pray on turbah) than on the carpet, so in this shia comunity this could be 'normal', as standard.

When i prostrate i try to not force my head too much on the surface as i have sensitive skin, to avoid blisters.

I have noticed i think on the channel 'madina', that sunni brothers have got the mark too, which is impressing considering i think they would be prostrating their head on the carpet.

Mashallah
Salaam