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Melted plastic on electrical boxes is a sign of trouble

Melted poly on top of an electrical boxes (light fixtures, outlets, ceiling fans) is a sign of trouble.  Have an electrician inspect the installation to ensure it is safe. You can help by ensuring the light fixture below has the appropriate bulb and wattage to help reduce the chances of over-heating.  This overheated fixture is also a source of warm moist air into the attic and should be sealed.
melted poly on junction box