I have a bad bruise that's healing but now i have a lump under skin?

Leave it alone: A lump under the skin in the area of a bruise is not unusual. Presumably, the lump is slowly dissolving blood from bleeding that occurred under the skin that did not break through the skin. Your body will slowly absorb the blood and the lump will disappear. This can take several weeks, sometimes a few months. There is no treatment for this other than leaving it alone.