LOTSof lice in hair without noticing ,a firm rubbery smallswollen lymp node is there -2 weeks already after the lice is removed, when it will go away?

Few weeks

Pediculosis
Lymph nodes react to local inflammation or infection. The first thing to check is that you actually DID get all the lice out and there aren't a few poking around in there, causing ongoing issues. Assuming they are all out, a lymph node can last several weeks, until the inflammatory cycle has played out.
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Excise Infection Inflammation Lice Local Pediculosis Swollen glands

Lice

Yes, usually it is a enlarged lymph node.
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Excise Lice Pediculosis Swollen glands