What Could Lump Under Foot With Dark Bruise At The Base Of Toes Mean?

Put an my slippers last night and felt a lump under my foot when I walked so I thought there was a lump in my slipper hurting my foot between the ball of my feet but nothing was there so I looked at my foot and the lump was in my foot and hurt to put pressure an it went to bed and forgot about it .Went to work ,stànd all day and still forgot about it .Came home ,changed my shoes put an my slippers and saw a dark bruise at the base of my toes so I looked at the sole of my foot and found a bigger bruise where lump was have no idea how this happened as did not hurt my foot .Can you help me understand this please and thankyou .catherine