Odd bump on my right shoulderblade?

Essentially, I'm 17 years old, and for about 4 or 5 months now I've had a bump a little larger than a mosquito bite on my back right shoulder. It is a little pinker than my skin, it isn't painful, and it feels like theres a little hard bit inside. I've sought out answers on the internet, but I can't seem to pinpoint what it is. Any suggestions before visiting a doctor?