PSTPIP1 and Pyoderma gangrenosum-acne-suppurative hidradenitis syndrome: For the first two reported PASH cases, it was hypothesized that the presence of alleles with a higher number of CCTG motif repeats close to the PSTPIP1 promoter deregulated PSTPIP1 expression and predisposed to neutrophilic inflammation (72).