Blendcap can also be used to make bumps.
Rough outline, limited testing:
Select closed curve on (flat?) surface, DelCorners or fillet corners.
The closed curve could be from polygon, voronoi, freeform curve, circle, ellipse, etc.
Extrude curve.
Delete curve,
Select edge of extrusion, Merge edges.
Blend edge, and adjust position, with respect to original surface.
Select the Blend surface and original surface, and Fillet with desired Fillet parameters and method.

- Brian