I have only experienced what you are describing when I get phelbitis, which is a sypmtom of my APS flaring. The bump I feel is a small blood clot in a minor vein.
I also get the spontaneous bruising. My bruising is always very very dark and colorfull however - purple, blue, black like a plum. Just the kind of thing you would remember doing to yourself otherwise.
Perhaps your doc is just being carefull and checking all possibilities - I don't want to alarm you, but certainly is suspicious for APS. Do let us know when you find anything out.
I also get the spontaneous bruising. My bruising is always very very dark and colorfull however - purple, blue, black like a plum. Just the kind of thing you would remember doing to yourself otherwise.
Perhaps your doc is just being carefull and checking all possibilities - I don't want to alarm you, but certainly is suspicious for APS. Do let us know when you find anything out.