Impetigo herpetiformis
Encyclopedia
Impetigo herpetiformis is a form of severe pustular psoriasis
Psoriasis
Psoriasis is an autoimmune disease that appears on the skin. It occurs when the immune system mistakes the skin cells as a pathogen, and sends out faulty signals that speed up the growth cycle of skin cells. Psoriasis is not contagious. However, psoriasis has been linked to an increased risk of...

occurring in pregnancy which may occur during any trimester.

It is the only well known pustular psoriasis which is treated with steroids.
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