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if you can't walk, that is serious.
black lump can be from a bruise or a broken blood vessel
how old are you?
can you upload a photo of this small black lump?
that is a very very blurry photo.
can you take one more clear?
you don't need to be closer with the photo. it is more blurry.
that looks like a mole or nevus
why can't you walk on it.
is it tender?
it looks like a benign mole.
most likely it is not causing the soreness on the whole foot
have you tried to ice and stretch your foot? you could have a plantar fasciitis cousing the pain on the whole foot.
it doesn't look like a spider bite.