A clinician I saw at the health center at my college diagnosed it as a ganglion cyst and gave me the option to have it aspirated on the same day. I agreed, and when he started the operation, he remarked, "well that's unexpected", and he showed me that instead of the usual thick fluid associated with ganglions, it was almost completely filled with blood. After he squeezed it all out, it returned to the normal flat state.
However, the lump returned during the night though not as large. I am trying to reschedule an appointment to have it looked at again, but that may take several weeks.
Have you ever encountered anything like this? Thanks.