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Figure 1: Patient 1. (a) Multiple brown and flat papules involving the perianal area. (b) Acanthosis with full-thickness epidermal dysplasia, atypical mitoses. (H and E,×100) (c) One month after ALA-PDT therapy

Figure 1: Patient 1. (a) Multiple brown and flat papules involving the perianal area. (b) Acanthosis with full-thickness epidermal dysplasia, atypical mitoses. (H and E,×100) (c) One month after ALA-PDT therapy