‘One comes across varied information regarding Hanuman’s form. His complexion is mostly red and rarely black. A red Hanuman is one smeared with a saffron coloured powder called sindur. Perhaps His black complexion is due to the influence of Saturn (Shani). Hanuman is famous as an incarnation or as a son of Lord Rudra. Since Rudra’s complexion is red, Hanuman too must have derived His complexion from Him. After He acquired a red complexion stories regarding His love for sindur were told.
Once after bathing Sita made a red spot (tila) with sindur on Her forehead. When Hanuman asked for an explanation Sita replied, “It is because of this that Your Master’s life is prolonged”. When He heard this, Hanuman smeared sindur all over His body !
Once when Hanuman was proceeding to Lanka with the Dronagiri hills Bharat struck Him with an arrow and wounded His leg. The wound healed with a mixture of sindur and oil. Hence sindur and oil are Hanuman’s favourites.’