Image on left is from 4 days ago, but the pimple was slowly forming over around 2 weeks.

The goop was sticky, not oily. Earphones are Panasonic RP-TCM130.

I was not able to find an explanation.
Something to increase cable lifespan, lubrication, rubber disintegrating, sweat and earwax that somehow got into the cable, dielectric grease, SCP-1407, no clear answer.

At first I thought the wires just somehow twisted. Nope.

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50 points

High resistance in a wire inside the sheath would generate more heat at that point, causing the plastic sheath to melt/bubble. So if the wire inside the sheath got damaged, pinched or some of the strands of wire were broken.

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37 points

These are earbuds, not big ass speakers. There shouldn’t be enough power going through those cables to do melt anything.

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14 points

You would be incorrect. If the power source shorts, it would heat the wires sufficiently.

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12 points

And how much power do you think the DAC in a phone is going to output?

The built in DAC in a phone can barely drive my headphones, let alone melt a silicone cable. They typically output less than a watt. On a good day. Rubbers melting point is 365c and 1 watt isn’t gonna do that.

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5 points

Doesn’t explain the goop though

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