Fig. 4
Histopathology of skin biopsy of Grade 2 psoriasis-like rash occurring 11 months after idelalisib initiation.
Haemotoxylin and eosin (H&E) stain showed psoriasiform epidermal hyperplasia with subcorneal pustule and mild perivascular superficial lymphocytic infiltrate, which expressed CD3, CD4, CD8 and PD1, with few cells expressing FOXP3 immunoreactivity