deflorescence

def·lo·res·cence

(dē'flō-res'ents), Do not confuse this word with efflorescence. Avoid the misspelling/mispronunciation defluorescence.
Disappearance of the eruption in scarlet fever or other exanthemas.
[L. de-floresco, to fade, wither, fr. flos (flor-), flower]

deflorescence

(dē″flŏr-es′ĕns)
Disappearance of an eruption of the skin.