What are the points you will look for in the examination of post auricular region?

On inspection, redness, swelling, oedema, fullness. discharging sinus, operated scar and obliteration of post auricular sulcus. On palpation, local raise of temperature, tenderness over the mastoid region and  fluctuation are elicited. Thikening of periosteum due to a previous infection may give a cord like feeling.