noun
Refers to a rounded protrusion or expansion, such as a swelling on the body, a bulge in a surface, or a puffed shape in fabric or dough.
パンが焼けると、表面にふくらみができた。
When the bread baked, a bulge formed on the surface.
彼の頬には、虫刺されによる小さなふくらみがあった。
There was a small swelling on his cheek from an insect bite.
Noun form of the verb 膨らむ (ふくらむ, 'to swell'), which is of native Japanese origin. The kanji 膨 is used for swelling or expanding.