Odd lump on tail :(

I was just feeding/petting my sugar glider Lilo and noticed a lump on her tail, about an inch from the base on the dorsal part. Its semi-firm, short hair, and did not seem to bother her by me palpating it. The color is a bit darker than the rest of her. Is this maybe an old wound that is healing (maybe i missed it, and there is some residual inflammation?) im worried.

Christi

it's definately a new bump..... i think it might be a hematoma from her getting her tail hurt somehow in the cage....... anyone familiar with this?