در این مجله، به پاک‌کننده‌ی جوش اشاره می‌شود.

From Lesson 364:Impersonal passives·Farsi

Questions & Answers about در این مجله، به پاک‌کننده‌ی جوش اشاره می‌شود.

Why is the verb می‌شود in the third-person singular when the subject seems to be "the acne cleanser"?
In Farsi, "the acne cleanser" isn't actually the grammatical subject here; it's the object of the preposition به. The active verb is به چیزی اشاره کردن (to refer to something). Because this verb takes a prepositional object rather than a direct object, its passive form is "impersonal." It defaults to the third-person singular (اشاره می‌شود), literally meaning "it is referred to the acne cleanser."
In English, the preposition "to" goes at the end of "is referred to". How does Farsi handle the preposition به in this passive sentence?
Unlike English, which can leave prepositions "dangling" at the end of a passive sentence, Farsi keeps the preposition firmly attached to its object. Therefore, به stays right in front of پاک‌کننده‌ی جوش (the acne cleanser), exactly as it would in an active sentence.
How is the word پاک‌کننده formed?
It comes from the compound verb پاک کردن (to clean / to erase). By taking the present stem (کن) and adding the suffix ـنده, we get the active participle پاک‌کننده, which means "cleaner" or "cleanser."
Why does پاک‌کننده have a ی added to the end before جوش?
The ی is the Ezāfe marker. Since پاک‌کننده ends in a silent heh (ه), it requires an explicit ی (rather than just an invisible short 'e' vowel) to link it to the following noun, جوش. Together, پاک‌کننده‌ی جوش means "cleanser of acne" or simply "acne cleanser."
Wait, doesn't جوش mean "boiling"? How does it mean "acne" here?
You're right that جوش is related to جوشیدن (to boil). However, in a medical or everyday context, it is also the standard Farsi word for a pimple, spot, or acne—think of it conceptually as a small "eruption" on the skin.

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