Intralesional immunotherapy with purified protein derivative (PPD) for cryotherapy‐resistant warts

Cryotherapy and immunotherapeutic modalities elicit nonspecific immune response against the human papillomavirus. There is a paucity of literature on the effects of a sequential shift to immunotherapy in cryotherapy-resistant warts.To study the efficacy of intralesional purified protein derivative (PPD) immunotherapy in cryotherapy-resistant warts.Patients with cryotherapy-recalcitrant cutaneous warts were given intralesional injections of PPD...