A few days ago, I noticed a small lump had formed on my upper back, just above the shoulder blade. At the time it was basically the same tone as the rest of my skin, but felt like something hard about the size of a pea just under the skin. Over the past few days it has gotten rather red (with tenderness and slight redness surrounding it for about an inch) and is somewhat painful when pressed. Some of the redness and pain I am willing to attribute to my own worrying and poking at it, but I am not sure.
It has me a bit worried, and rather uncomfortable. Is this lump something to worry about? And, is there a way that I could likely treat it without going to the doctor, as I am extremely broke?