The article presents a clinical case of pustular psoriasis and arthropathy in a patient with HIV infection. The diagnosis of psoriasis was confirmed by morphological examination. Signs of arthropathy were confirmed by X-Ray: presence of oligoarthritis of the distal interphalangeal joints of the fingers and feet was seen. Dactylitis severity ― 23 points, the Ritchie index ― 2, DLQI ― 28. The clinical course of psoriasis and its treatment in HIV-infected patients was considered after taking into account the data from literature and the patients current condition and observation. The above observation of a combination of several clinical forms of psoriasis (vulgar, pustular and arthropathy) in patients with HIV infection is an illustration of the features of the course and comorbidity of chronic dermatosis and AIDS, due to the influence of the infectious process, immunosuppression and ART. The development of pustular form and arthropathy creates the additional challenge of prescribing basic systemic treatment for severe and complicated psoriasis in an HIV-infected patient due to the presence of contraindications due to comorbidity. The glucocorticosteriod selected by the committee was effective on the skin and joint pathological processes, without having any negative impact on the course and treatment of the HIV infection. Such cases require further study and development of methods for the treatment of patients with comorbidity and their inclusion in an additional section in the clinical recommendations for the diagnosis and treatment of psoriasis.