A mother sitting at her door, enjoying life on the street.

The red forehead mark (Dravidian poTTu, Sanskrit tilaka, Tiikaa / Tikaa).

The origin of this red mark would be the blood of victims smeared on their head.

Nowadays this mark has a religious significance and is a visible sign of a person as belonging to the Hindu religion.

What is less know is that this red powder has a chemical stimulating inciting effect on the gland in your forehead responsible for the rutting behaviour.
It burns in to the skin so that a mark like a tatoo is often seen.