Solved! sir is it safe to use earphone if any sticky yellowish liquid is coming out.

How harmful it would be is impossible to say but it can't be good for you. Get new earphones.
sir thanks for informing me but my elder brother wants to know that what are the harmful effect of it? by the way i have ordered a new headphone. and plz answer so that i can tell my brother.

sir please tell the name of that yellow substance plzz its a humble request
 
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Sorry I don't know for sure. It could be ferrofluid from the speaker inside the earphone or something from the plastic that the earphone is made from.
You would have to find a chemist to tell you the name of that substance.