What Could Lump On Forearm Indicate?

Hi, I got a lump removed from my forearm two days ago, it started out as a small (what it looked like at the time) ingrown hair, I pinched it and clear liquid came out. I neglected it for several months until it got to the size of a large pea. Then hair started not growing on it. I was able to move it around a bit under the skin. The dermatologist removed it without a second thought, didn t even take a small sample for a biopsy, just cut the whole thing out and sent it to get checked. It gave me some comfort that hopefully he was thinking it wasn t harmful in any way and just cut it out at the spot. But it looked like a chunky mass of fat, honestly. Could it have been harmful? What s the chance it s dangerous?