Yes, myiases is a Scrabble word!
...and is worth 12 points in Scrabble, and 12 points in Words with Friends
myiases
Noun
1. Infestation of the body by the larvae of flies (usually through a wound or other opening) or any disease resulting from such infestation
What Scrabble words can I make with the letters in myiases?
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Words that can be created with an extra letter added to myiases:
R:emissary