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your doctor can sterile needle into your skin and then examines the area one to two days later. this is a pathergy test. if it is positive, a small red bump forms under your skin where the needle was inserted. This indicates your immune system is overreacting to a minor injury
herpes can cause oral cold sores. this is very common.
it is also very common to have benign cysts like hemangiomas and benign cysts in your liver.
I would trust your ID doctor over a lyme doctor. a lyme doctor should also be an infectious disease doctor
lyme disease can be easily treated with several weeks of doxycycline antibiotics.
you were treated with IV antibiotics already so this should have taken care of the lyme disease.
let me know if you have questions.