Unfortunately it is not possible to upload a picture on our site and no one here will have the expertise to tell you what this small bruise might be. I would suggest you give your doctor a call tomorrow morning and have this looked at. They will be in the best position to tell you what it might be and give the reassurance you need.
Other members of our community may have had a similar bruise in the past and I hope they will come here and share their experience with you.
