The boy was diagnosed with phimosis due to his tight foreskin and needs further medical examination.

phimosis 是医学术语，由希腊词根 phimos（意为"套索、束缚"）和后缀 -osis（表示"异常状态"）组成，字面意思是"束缚状态"，在医学上特指"包茎"，即包皮过紧无法正常翻动的症状。