On average, prisoners are younger compared to the normal population, and more than 90% are male, which indicates a different scope of medical issues [8]. However, prisoners also have a higher proportion of individuals with chronic diseases, especially mental disorders or chronic infections like hepatitis, requiring ongoing medical care [9-14].

Prisons in Germany ensure these medical services not only using in-house resources but also regularly using external medical service providers to fulfill these tasks [15-17]. For dermatology issues, this means complete reliance on external dermatology facilities because none of the more than 280 correctional facilities in Germany provide in-house solutions.

Following the principle of equal standard of medical care for prisoners as people living in the community, the scope of medical services in German correctional institutions should correspond to the scope of services provided by the statutory health insurance funds. However, prisoners are no longer covered by statutory health insurance when they start their prison sentence in Germany [7]. The costs for medical care must be covered by the prison authorities of the federal state. The expenses for the correctional facilities [18,19] as well as the medical care in the German correctional system have risen steadily, and the federal states of Germany have to cover these costs [20]. A substantial amount is caused by personnel and transport costs. New solutions are needed to both provide the required standards of care and control costs [21].

During the last decades, telemedicine in various settings has become a useful tool to support health services [22]. In 2018, the 121st German Medical Congress approved an amendment to the medical professional code of conduct (Muster-Berufsordnung für die in Deutschland tätigen Ärztinnen und Ärzte [MBO-Ä]) and enabled remote telemedical care [23]. Since 2019, German correctional institutions have started to use telemedicine for dermatology requests [20,24]. Initially, this service was provided through a pilot project by the Ministry of Justice of Baden-Württemberg and expanded to other German federal states and correctional facilities in subsequent years. Currently, these dermatology teleconsultations are offered on a fixed weekly basis for acute cases on demand within 24 hours. The prison can choose between a store-and-forward mode (asynchronous operation) with photos and a standardized form only or an additional hybrid option with a live video consultation in an interdisciplinary round including the treating primary physician simultaneously (synchronous operation). This allows a direct exchange of medical information as well as the opportunity for further counseling with colleagues in charge of the case. Both modes represent an alternative to transportation and presentation of prisoners in dermatology facilities outside the correctional institution, and we experience an increasing number of requests to our institute from German correctional institutions.

Although the rate of completed cases through video consultations in either store-and-forward mode or in live presentation is high [8], there are limitations to the processing of certain requests. With this paper, we analyzed 651 cases of our teleconsultations for German correctional facilities from February 2020 to April 2023. This study aimed to provide evidence on the value of teledermatology care provided to German prisons and detect limitations for this mode of service with a focus on cases that could not be processed without live on-site consultations.

A systematic comparison of the advantages and disadvantages of video consultations for prisoners was carried out based on a descriptive cross-sectional analysis of 651 applications for teleconsultations in German correctional facilities from February 2020 to April 2023, supplemented with literature research. The selection of the evaluation criteria was based on quality criteria from the German guidelines for teledermatology from 2020 [25].

We retrieved all data from the documented request forms from February 2020 until April 2023. Data included:

The ethics committee of the Medical Association of Hamburg confirmed that there was no further ethical approval necessary for retrospective analysis of anonymized data in accordance with the ethical standards of the responsible committees (institutional or regional) and with the Helsinki Declaration of 1975, as revised in 1983.

Part of this study was a spatial assessment of the potential physical accessibility of prisoners to dermatologists. The data basis for all 284 prison locations was a list from the justice portal of the federal and state governments from 2020. After geocoding and referencing the locations, they were loaded and mapped in a geographic information system in ArcGIS v. 10.8.1 (ESRI). As a proxy for accessibility, physician density was compared to correctional facility locations. Data were provided by Kassenaerztliche Bundesvereinigung (KBV; data status 2022).

We conducted a descriptive analysis of all variables with SPSS v.26 (IBM Corp), including demographic data (eg, age and gender) and medical data (eg, diagnosis, suggestions for therapy, and further management of the skin disease). Thereby, we categorized open entries, for example, therapy modalities, into categories such as topical or systemic therapy. We conducted a subgroup analysis for cases that were not closed after one video consultation regarding diagnoses or recommendations for further management modalities.

We offer teledermatology support for correctional facilities in Germany. As of May 2023, a total of 38 prisons in 6 federal states in Germany used this service regularly, with rising numbers. Of the 651 cases analyzed, we were asked for 412 diagnoses, 497 therapy recommendations, and 62 follow-ups for reconsidering or changed skin conditions. We provided a time-saving response within 1 week after the request or, in urgent cases, a response within 24 hours in store-and-forward mode. The most frequently diagnosed skin diseases were eczema, skin infections, acne or acneiform dermatitis, and tumor differentiation [26].

In Germany, there are 284 locations for correctional facilities distributed across all 16 federal states (Figure 1) [25]. The distribution of the prisons differs from being centrally located in metropolitan areas to being far from cities in rural areas. This is important for the accessibility and vicinity of medical specialists (eg, dermatologists).

The transport of an inmate to extramural facilities requires at least two staff members, and in cases of low personnel resources, the police forces have to support the institutional staff in Germany. We analyzed our 651 cases for finalization and closure of the case in terms of sufficient data for a diagnosis, recommended therapeutic options in-house, and a need for further diagnostic or therapeutic procedures requiring transport to outside facilities.

Of the 651 cases, 608 could be finalized with a diagnosis and recommendations for treatment and further management without need for extramural transportation of the patient, 83 had to send additional material like laboratory results or images for proceeding with the cases, and 43 could not be solved by teledermatology and consequently needed extramural support on site.

Of the 43 cases, 22 were questions concerned with the type of tumor (Table 1), for which we recommended live examination on site or biopsies that could not be performed inside the prison itself. Usually, the in-house physicians do not perform biopsies, and therefore, the teledermatology consultation did not lead to a successful closure of the case in these requests.

A total of 2 cases were exanthems of uncertain origin with recommendation for biopsies; 6 cases were eczema with missing anamnestic or clinical information for a differential diagnosis and proper conduct; 5 cases were suspected skin infections, and the facilities did not respond to our request for further clinical information or laboratory results like swabs or culture; 1 case showed the clinical picture of psoriasis but insufficient imaging of the extent and a lack of information about comorbidities and previous management; 2 cases sent images of acneiform lesions but lacked clinical information; 1 case asked for differential diagnosis of dermatitis herpetiformis Duhring but did not send sufficient clinical or anamnestic data; and 1 case asked for management of alopecia without further clinical or anamnestic information. Interestingly, the number of cases that were sent without a question for dermatology was rare (1 question for dysesthesias with a neurological background and 2 cases without any information about a skin problem).

According to the Guideline for Teledermatology [27], general screening for skin cancer should not be made by teledermatology alone. If the prison was able to send accurate dermoscopic images, there was an opportunity to provide a statement about the type of lesion or to rule out malignancies, but if the digital imaging was not sufficient, there was a need to consult the physician in charge on site. Cases with the need for general inspection of the entire body or detection of small pigmented lesions as well as skin conditions with the need for palpation (eg, lymph nodes), had to be referred to a physician on site if available or transported to outside facilities. Of our 651 cases, 96 asked for diagnosis of different types of tumors, of which 22 could not be solved by digital imaging, clinical description, and additional video consultation. Some cases could be solved by educating the in-house physician about screening procedures.

Due to the fact that no prison in Germany has dermatology resources, the intramural colleagues in charge of the facility service, mostly general practitioners, have to treat and follow dermatological cases. With the help of telemedical expertise and discussions online, we allowed for the exchange of knowledge about the case presented or skin diseases in general and, therefore, enabled the colleagues to become more capable of proceeding with further cases on their own. All of our video consultations were attended to by in-house medical staff from the prison, and in all virtual visits, we exchanged information about the present skin disease as well as therapeutic options and guidelines.

The number of photos per case was not limited, and 0-27 photos were sent for one request. Insufficient photo quality of at least one photo was found in 124 of the 651 requests from February 2020 to April 2023, but only 12 cases did not upload any sufficient imaging. The quality of the photos sent improved with the number of cases an individual prison performed and if the service provider supported technical solutions and devices.