Step II Rash Naso Labial Sparing

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monsoon338

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Which diseases have this and why?

From what I understand:

SLE

Parvovirus B19

Both of the above diseases have naso-labial sparing of the rash. Why does this happen?

Does the sun play a role in this - ex that the nasolabial fold is protected from the sun due to it being shaded?