등 왼쪽 상단에 작은 덩어리가 생기는 원인은 무엇일까요? 회색 반점처럼 보이며, 약 2개월 전부터 계속 있습니다.
I Have a tiny lump on the upper left side of my back. I have had it for about 2 months now. It is like a little grey spot. So please help.?
What can cause a tiny lump to come up on the upper left side of the back? It is like a grey spot and has been there since about 2 months now. 
I Have a tiny lump on the upper left side of my back. I have had it for about 2 months now. It is like a little grey spot. So please help.?