Underarm bump

I've had this weird "bump" on my right underarm for....three months. It has gotten larger and smaller, but it has never been painful. It is "squishy". My skin has never been red, inflamed, draining, or malodorous. Two Mondays ago, I became more aware of the bump when my arm was resting at my side, and I experienced slight tingling/loss of sensory perception in my right ring finger and pinkie. I am not 100% sure that the tingling I experienced was a result of the fluid in the cyst pressing against my ulnar nerve because sometimes I experience that anyway since the accident two years ago and the weather was changing and that is usually when I experience the tingling.


Since I had already taken off Thursday morning at work, I scheduled an appointment with my GP. He palpated the cyst and moved my right arm into various positions. The diagnosis, sans scan/xray, was sebaceous cyst, and I was given a round of Keflex and instructed to put warm moist compress on the area two times a day to encourage circulation.

That was coming up on twelve days ago. The cyst is probably 90% gone, and at the follow up this morning, I was released barring it doesn't return. Here are some pics of the cyst that I took over the course of the past couple of months. It was always bigger in the morning when I first woke up.