Often unexplained: Most young adults have at least one palpable lymph node in the neck, and if it's sampled, it usually shows follicular hyperplasia. We usually don't find the cause and assume it was just a though node fighting germs. If a cause is found, it's often hiv, rheumatoid arthritis, syphilis, toxoplasmosis, or common variable immunodeficiency.
Answered 11/30/2018
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