beleg

1. mark; imprint
   Rat je ostavio dubok beleg na toj generaciji. — The war left a deep mark on that generation.
2. mark; sign; marker
   Taj stil je prepoznatljiv beleg njegovih filmova. — That style is a recognizable mark of his films.
   Ta zgrada nosi beleg svog vremena. — That building bears the mark of its time.
3. (on the skin) birthmark
   Ima mali beleg na levom ramenu. — He has a small birthmark on his left shoulder.

In everyday speech mladež usually means 'mole'; it is not a general term for every kind of birthmark.