Thanks for writing to us.
The small lump on the right side of your neck is likely to be a swollen lymph
node which has appeared due to the neck infection
that you suffered a few days ago. This usually subsides on its own once the infecion is well controlled.
The pain in the shoulder and the back is likely to be a muscle spasm which can be relieved with mild pain killers and muscle relaxants after consulting your physician.
I hope this information has been both informative and helpful for you.
Dr. Rakhi Tayal