I have had a hard lump golf sized since sept 2011 and it is getting bigger.  it is between my collar bone and shoulder blade on my back.  it does not hurt, it is very hard and is not bruised.  the doc is doing an ultrasound to see if it is lymphoma.  what do you think?  I am a 47 year old male.
Hi! Thanks for writing to Chat Doctor sharing your health problem! Well, it is very common in our clinic to get such lumps which are painless, hard and increasing in size and therefore, I would like to consider few possibilities in your case of the lump between collar bone and shoulder blade as follows