Til, or beauty spot, on eye is interpreted as either good or
bad in Hindu culture. Luck or unlucky factor depends on the position of the
beauty spot on the right eye or the left eye.
It is widely believed that if the til or beauty spot is on
the right eye then the person will have good relation with the opposite sex.
If the til is on the left eye then person will have bad
relation with the opposite sex.
Are such things mentioned in Hindu scriptures? No. These are
traditions followed by some communities in some regions. Such things are not
followed by all Hindus.
Should I believe in them? No you don’t need to believe in
such things as it has nothing to do with the core teaching of Hinduism.