I have just noticed black 1/2 inch worms where my shower meets (it is in two pieces put together). They live where moisture stays , most likely, hidden in the crack where both sides meet. The shower is on the second level, I live in CT, and we have a basement. Sometimes I see little flies that look like moth flies but have a distinct large white dot on each wing. Could the worms be turning to flies? Thank you.
Psychodids, also known as sewer flies, moth flies, sand flies, have such a larvae as you describe. I have answered this very question numerous times in the past. If you will look for these similar questions in the index of past questions and answers, you will find what you are looking for.
If you require further assistance please follow up with an additional request.
Best wishes Cathy,
Chicago Pest Control Exterminatior