RT Book, Section A1 Lin, Steven W. A1 Goldfarb, Noah A2 Soutor, Carol A2 Hordinsky, Maria K. SR Print(0) ID 1177006716 T1 Skin Diseases of the Trunk T2 Clinical Dermatology YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9780071769150 LK accessmedicine.mhmedical.com/content.aspx?aid=1177006716 RD 2024/03/29 AB The trunk is a general term for the core body region including the chest, abdomen, flanks, and back. The trunk has many unique characteristics. In many people it is a site of minimal sunlight exposure as it is usually covered by clothing. Dermatoses within this distribution may be caused by an allergic contact dermatitis due to chemicals in clothing, soaps, dryer sheets, and other allergens. Since the trunk is generally covered by clothing, this occlusion often creates a warm, humid environment ideal for the development of diseases such as folliculitis, acne, and tinea versicolor. A high density of sebaceous glands in the presternal area may provide an ideal location for pityrosporum ovale yeast proliferation, making this a common location for seborrheic dermatitis. Skin folds, such as the abdominal skin folds and inframammary creases are prone to intertrigo and/or maceration, increasing the risk of developing cutaneous candida infections among other dermatoses. The trunk is the most common location for herpes zoster. The umbilicus is unique in that it has a high density of apocrine glands. Interestingly some conditions including psoriasis and scabies often favor this site.