Can keloid spread to the near by tissues?

Yes. Keloids can grow but are limited to skin and soft tissue.
Will enlarge. Me, kids have a tendency to become larger but they do not metastasize.
Local spread. The definition of a keloid is overgrowth of the scar tissue into the surrounding tissue over the boundaries of the scar. Different from a hypertrophic scar which is simply a thickened scar, remaining within the boundaries of the original scar. It can continue to grow, see my answers in how to treat safely and without stimulating further growth. Mostly do not allow anyone to cut it, without a plan.