HSP90AA1 and acquired epidermolysis bullosa: We have previously found that Hsps, including Hsp70 and Hsp90 represent important pathophysiological factors and potential treatment targets in autoimmune blistering skin diseases (AIBDs), such as bullous pemphigoid, dermatitis herpetiformis, and epidermolysis bullosa acquisita (EBA), as well as psoriasis (Tukaj et al. 2013, 2021, 2022; Kasperkiewicz et al. 2014).