Impetigo Herpetiformis (Pustular Psoriasis of Pregnancy)- Considered pustular psoriasis variant during pregnancy; late first trimester to third trimester
- Presents typically with pustules on erythematous base initially in intertriginous areas, ± fever, chills, malaise; recurrence with OCPs, menses, subsequent pregnancies
- Histology: same as pustular psoriasis
- Fetal risk: placental insufficiency
- Labs: hypocalcemia, ↑ ESR, ↑ leukocytosis
- Treatment: oral corticosteroid, treat hypocalcemia; resolves in postpartum period
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