Why is the USB LED garland heated?

Sergei asks:
I bought a LED garland powered by USB, in the place marked in the picture when connected it is heated to a state you can not hold with your fingers, what’s the matter, what should I do?
LED garland with USB


The answer to the question:
Hello. The fact is that I did not encounter such garlands. But there, apparently, just a wire connection and a current-limiting resistor, and it should warm up, the question is how much is strong. If the insulation does not burn out and does not melt, then it should be so.

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