One's Back
Back
noun
The middle of your back is one's back (or your back).
The reading is the kun'yomi readings, put together, making it the words 背 and 中 combined.
背中のニキビを無くす方法が知りたいよ。
I want to know how to get rid of the acne on my back.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up what ever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.