Hello & welcome to Just Answer,
Without the benefit of having a detailed clinical examination, it would be very difficult for anyone to provide you with an answer for your problem, as you have already been seen and assessed by a surgeon, a neurologist, infectious disease expert, and two other physicians, and you say that no conclusion has been reached and you continue to suffer since May last year. If you would allow me, then I would like to ask you to answer few of my queries:
Where exactly is this bump – in terms of fingerbreadths from the back of your ear, and how high up is it from your hair line in the neck?
How big is it in terms of cms?
How much would you say is it swelled up or raised from your scalp, again in terms of cms?
Do you feel any satellite swellings around this bump?
Do you have any bump below your right jaw in the neck?
Any swelling immediately in front of your ear near the tragus of the ear (small of the ear)?
How is your external ear –any swelling?
If you move your ear to and fro while holding it with your fingers, do you get any pain?
Anything that you have missed out in telling?
Have you seen ENT doctor?
Thanks. I shall be waiting for your reply.