Triumvirate Presentation and Treatment of Psoriasis in the Setting of HIV and Treponema pallidum Infection.

Psoriasis is an autoimmune condition in which the immune system attacks healthy skin cells, causing the accelerated formation of new skin characterized by scaly patches or plaques. These lesions are formed due to the formation of new skin underneath dead skin that has yet to be shed. Although the cause of psoriasis is not completely understood, it has been associated with infections that may trigger or exacerbate the condition. Syphilis, a highly infectious sexually transmitted disease, may trigger a psoriasis outbreak; because syphilis is known as "the great imitator", it can present as many other chronic dermatoses and therefore often makes it very difficult to diagnose. Here, we describe a case of a 17-year-old Vietnamese male from Dong Nai Province who was initially diagnosed with psoriasis and later diagnosed with syphilis and HIV infection upon further investigation and testing.