DLE (discoid lupus), SCLE (subacute cutaneous), DILE (drug-incued) and neo-natal all share *some* but *fewer than 4* of the "4 of 11" SLE criteria. As in mathematics, this makes them all "subsets" of SLE.
In DLE, the mildest subset, you may only have a few of the "4 of 11", e.g., discoid lesions & arthritis.
In SCLE, the intermediate subset, many people actually score a "4" or more, but they are less likely to be the "worst 4"---meaning the risk of the worst criteria, kidney or CNS, is thought to be somewhat less than it is in SLE.
You know, I never gave the use of this word any thought, but maybe this word isn't in general usage. Or maybe it is newer usage. Or maybe my Manhattan rheumie & dermatapathologist, who both sued it independently of one another, were both just giving me a vocabulary test!
Does this make good enough sense? I've been DULL today & dropping things. Bye for now, Vee
P.S. Another surprising fact is that rashes can cross subsets. In SLE, the butterfly rash is the most common, but you are also "eligible" for SCLE and discoid lesions. Same goes in the others. I saw a drawing of 3 circles, representing SLE, DLE, and SCLE---and each circle overlapped a LITTLE onto the other 2.