Which of the following conditions is NOT associated with junctional nevi?

Junctional nevi, commonly known as moles, are usually flat and occur where melanocytes are present at the junction between the epidermis and dermis. Tumor-associated conditions and genetic syndromes have a well-documented link to an increased risk of developing certain types of nevi, including junctional nevi.

Psoriasis is a chronic inflammatory skin condition characterized by the rapid proliferation of skin cells leading to scaling and inflammation. While psoriasis affects the skin, it does not lead to the formation of junctional nevi. This condition is primarily associated with an autoimmune response rather than a proliferation of melanocytes or the formation of pigmented lesions typical of nevi.

In contrast, other listed conditions (tuberous sclerosis, xeroderma pigmentosum, and generalized neurofibromatosis) impact the skin and/or involve the melanocyte pathway in ways that could lead to an increased number of nevi or specific types of skin lesions. Thus, they have a clearer connection to junctional nevi, making psoriasis the exception in this context.