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Yes it looks that it is a simple bruise. It has developed since this morning. It is very common that people may have bumps / impacts that at the time do not seem that had or significant and so they do not stand out in our memory . The occurrence of a bruise without recall of any injury is very very common. It should not be anything to worry about . I hope that this is helpful for you
Let me know if you have further questions or concerns.I will be happy to get back with you.If my answer has been helpful and to your satisfaction then please remember to leave positive feedback Thank you and Best Regards,
Anthony Bray MD