Get weight off foot. Contusion(bruise) metatarsal requires weight to be removed from forefoot. This can be accomplished in a variety of ways. Padding the forefoot with relief beneath the effected metatarsal is the easiest.
Icing is good. Does it hurt when you walk? If so, them immobilization maybe required with either a surgical shoe or cam walker boot.
TREATMENT. I guess a "bruised" metatarsal is a sore, but not broken, metatarsal. Technically, a bone bruise can only be detected on MRI, not x-ray. Regardless, rest is probably best. I would use a wooden-soled surgical shoe, allowing you to walk on it.