I warmly Welcome you! Thanks for consulting me at virtual clinic. I have carefully worked through your case, and I can realize your health worries. Being your physician, I assure you not to worry as I will take care all of your medical concerns.   Its due to soft tissue injury and haematoma/oozing of blood and accumulation of mediators and product of inflammation which leads to swelling. Apply heat. Apply Voltaren Gel 4times a day. It will go away soon. If you need further, detailed and quick assistance related to any health issues, feel free to ask me a question directly from my profile. You can also attach Lab reports and pictures with direct question. May you get very well soon and have a wonderful time ahead. Please don t forget to give your valuable feedback and five star rating, to help me assist you in a better way. Click at I Find This Answer Helpful too . Please, write a review about your experience with me.   Regards! DR. HANIF PHILADELPHIA, USA