swollen neck glands
癧 refers specifically to swollen neck glands, a medical condition involving inflammation or enlargement of lymph nodes in the neck.
癧 combines the sickness radical 疒 with 歷, which likely contributes the sound レキ. The character is used for a specific medical condition, but the detailed historical development of this compound is uncertain.
The sickness enclosure 疒 wraps around 歷, a shape associated with passing or history. Picture a sickness that leaves a visible history of swelling in the neck glands.
For レキ, imagine a lake (レキ) of fluid causing the neck glands to swell: lake -> レキ, and the sickness enclosure holds the swelling.
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scrofula