This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
痬 combines the sickness radical 疒 with 易, but the exact historical development and original meaning are uncertain.
The sickness enclosure 疒 wraps around 易, suggesting an illness that is easy to catch or spreads easily, but the true meaning is unclear.
For エキ, imagine an easy-to-catch sickness spreading at a train station (駅, えき): 駅 -> エキ, and the sickness enclosure 疒 makes it an illness.