Behcet's disease (BD) is a multisystemic inflammatory vasculitic disorder which diagnosed by clinical criteria because of the lack of specific laboratory test and/or pathognomonic histopathological findings. The most frequent diagnostic criteria of this disease are mucocutaneous lesions, appearing at the disease onset or during the course, usually begin before significant organ dysfunction. According to BD International Study Group Criteria, one of the five criteria is dermatologic findings including pseudofolliculitis, acneiform nodules or papulopustular lesions (PPL) diagnosed by clinician in postadolescent patients. In some case reports and clinical studies, the PPL of BD are also denoted as Behcet's pustulosis, folliculitis, acneiform eruptions and pseudofolliculitis. Owing to implementation of follicular lesions in these criteria, there may be difficulties in the distinction between most of the PPL of BD and the other acneiform eruptions/nonspecific follicular lesions (e.g., acne vulgaris, bacterial folliculitis, steroid acne). Certainly, clinicians should distinguish these patterns for accurate diagnosis. Although earlier studies involve numerous quandaries regarding the diagnostic histopathologic pattern of BD (e.g., whether to include vasculitis or nonspecific folliculitis), it was reported recently that the determination of vasculitic changes in histopathological and direct immunofluorescence results might be useful in the differential diagnosis of patients suspected to have BD.
Cryotherapy, also known as cryosurgery or cryoablation, is a common dermatological treatment that is an expanded area from benign to malignant lesions. The system has been designed as a localized freezing cold that causes the destruction of cell integrity. The treatment has been also used for all ages, which is not required to have a condition of wellness. It is convenient, fast, and easy to apply in clinics, and there is no need for anesthesia. Additionally, multiple lesions are also cured in the same sessions. After the treatment, recovery period has not taken much longer and also has simple adverse effects, which are tolerable. Lastly, cryotherapy has gained excellent cosmetic results. It is highly effective for actinic keratosis and is the treatment of choice for most old patients who show poor cooperation and recurrent multiple lesions. Additionally, due to increasing premalignant lesions all over the world associated with increasing age, it is a considerable choice for lentigo maligna and Bowen's disease. In non-melanoma skin cancers, it is also the most important option in patients who do not undergo surgery and when other options are not appropriate. In this chapter, the use of cryotherapy for premalignant and malignant cutaneous disorders has been mainly focused.
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