Tender lump at r base of skull developed today history of migrains, shingles twice in six months, and viral meningitis following first episode of shingles?

See your Doc: You really need to check with your current doctors as to the significance of all of your symptoms and findings. You need face to face examination and follow-up.

Enlarge lymph node: Any lump which is tender, indicate it is inflame, if it is under skin it may be a lymph node. Most likely you have acute inflamed lymph node, in rt base of skull due to any sckertch infection of skin over scalp. I did not think it is related to your previous condition, but we can answer better after seeing you.