Hello,
For the time being, take homoeopathic medicines - Arnica 200 and Rhus Tox. 200 - take both of them thrice daily for 1 week. Also, apply Schwabe's Topi-Arnica and Topi MP Gel on the affected area in circular motions gently thrice a day.
Even after a week, there is no improvement seen, then get yourself examined to rule out any possibilities.
Get back to me thereafter.