痎 is a Chinese hanzi, listed here under the keyword “two-days' fever or chills from malaria”. It is built from 疒 (sick) and 亥 (twelfth earthly branch).
On KumiJi Glyph Explorer, open the parts search and type “sick” + “twelfth earthly branch”. 痎 is among the results, together with every other character containing the same shapes.
Open 痎 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.