Hiya, I noticed a lump on my left arm crease a few months ago, that seems so have grown a little bit. It's not rock hard (but it Hard ish) but also isn't movable and no pain, but since it's grown I have been getting weird sensations down and up my arm.

went to the doctors and he's ordered a ultrasound scan, he did mention sarcoma but also said it's not like a stone so possibly not sarcoma but also was concerned as it did not move or cause any pain... 

The scan is meant to be within 2 weeks but due to covid-19 I'm still waiting for a call, I'm not entirely sure why I'm posting but if anyone has any relation to this it would be appreciated. The waiting is really hard, Thanks