I hit my forehead on the right side , in a sharp corner and got a big painful bump. just after ive got pain on my right ear, became red and hot and looks like getting a bit purple behind it. is there a reason of concern? i am alone and afraid?

My sense is that you did not injure your ear & the discoloration behind the right ear is blood leaking under your skin from the lump ( hematoma) & gravitating downward ending behind the ear. Apply cold compresess to the hematoma in your forehead for 24-48 hours. Redness& hot sensation of the ear is somewhat puzzling. If it's due to anxiety the left ear would have similar redness. ?See your GP