Final answer:
Papulosquamous drug eruptions can be caused by contact dermatitis, delayed-type hypersensitivity, autoimmune diseases, and skin infections.
Step-by-step explanation:
Papulosquamous drug eruptions can have multiple causes, including contact dermatitis, delayed-type hypersensitivity, autoimmune diseases, and skin infections. Contact dermatitis can occur when a person is exposed to certain substances, such as latex. Delayed-type hypersensitivity can be triggered by a tuberculin reaction. Autoimmune diseases like diabetes mellitus type I, multiple sclerosis, and rheumatoid arthritis can also contribute to papulosquamous drug eruptions. Skin infections caused by various viruses and bacteria, such as varicella-zoster virus, human papillomavirus, and Pseudomonas spp., can also lead to this condition.