I am sorry to know about your symptoms,
Based on what you mentioned,it seems that your symptoms are due to soft tissue injury as it may present with similar discoloration and goose egg as you described.
From what you have described,you may see a regular physician instead og going to emergency ,the physician will be able to do a physical exam,if required imaging tests to confirm the diagnosis.
Meanwhile you may take over over the counter motrin which will help subside the increased sensation(due to inflammation) and help in faster healing too.
If the symptoms (dicoloration) do not subside in a week,then ask the physician to do platelet count,as low platelets(thrombocytopenia) may lead to similar persistent progressing discoloration.
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