Learn English – the problem that gets worse after you try to solve it

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Example sentence – This problem is a _____ which gets complicated every time you try to solve it.

Is there such a word that represents a problem which will become worse if/when one tries to solve it?

Note – After seeing the comments and answers I'd like to add that this is not a can of worms or Pandora's box because it doesn't create a new problem but just worsens.

Example: Magic leaves protecting a fruit by enclosing it. Every time a leaf is touched, all the leaves close together further, that is more tight than before.

Best Answer

can of worms

informal. a situation that causes a lot of problems for you when you start to deal with it:
Corruption is a serious problem, but nobody has yet been willing to open up that can of worms. — Cambridge Advanced Learner’s Dictionary & Thesaurus