Unknown: Pink pigtail in a skin biopsy: What is your diagnosis?

    A 63-year-old man undergoing treatment for immunoproliferative disease was suspected of having a pruritic drug eruption. Subsequent skin biopsy revealed three intracorneal pink, refractile pigtail-like structures, one attached to the stratum corneum and the other two free in a cavity (Figures 1 and 2).