noun
freckle; ephelis
Medical term for freckles; in everyday conversation, そばかす is far more common.
皮膚科の先生が「これは雀卵斑ですね」と説明してくれた。
The dermatologist explained, 'These are ephelides.'
そばかす is the common, everyday word for freckles. 雀卵斑 is a formal medical term used mainly by specialists.
From 雀 (sparrow) + 卵 (egg) + 斑 (spot), referring to the small, speckled appearance of freckles resembling sparrow eggs.