Irritant intertrigo — ininflammatory skin lesions in the form of limited redness develop due to skin-to-skin friction usually in the groin area or under the breast due to exposure to sweat and heat. Diabetes mellitus, increased body weight and poor hygiene favour the development of lesions. Often, secondary bacterial infections can develop.
Therapy consists of the use of topical corticosteroid creams, if necessary antifungals and antibiotics along with products and measures to keep the skin dry.
Tinea cruris, also known as jock itch, is a fungal infection commonly affecting in the groin area. It has a form of well defined red fields with a pointed edge that is covered with scales, with or without pustules and bubbles. Lesions spread peripherally with central clearing. Therapy consists of topical antifungals.
Candidiasis is a skin infection caused by fungi of the Candida genus. Red patches are seen in the groin and scrotum areas or under the breast, and pustules or papules are often present on the edges. It occurs more often in people with higher body weight, diabetes mellitus, who are on immunosuppressive or antibiotic therapy. Also, occlusion, increased humidity and heat contribute to the development of the disease. Treatment is carried out by applying antifungals and drying out the affected area of the body.
Seborrheic dermatitis — clearly defined red patches with or without scales can be observed in the groin area. Lesions are usually associated with the appearance of typical reddish patches with oily scales on the face, behind ears or on the chest. Therapy consists of antifungal shampoos and creams, as well as topical corticosteroid preparations. The disease is chronic, with phases of improvement and exacerbation, so active and preventive therapy is very important.
Erythrasma — Occasional lesions in the skin folds, especially in the groin area, under the breast and less often in the armpits may be due to a mild infection caused by Corynebacterium minutissimus. Oval shaped patches of reddish-brownish colour appear, covered with tiny scales, expanding peripherally. The diagnosis is made on the basis of the clinical signs or examination with Wood’s lamp revealing coral-red coloured lesions. In therapy, antibiotics and antifungals are used topically, in addition to keratolytics. Occasionally, erythromycin is also used.
Inverse psoriasis is characterised by sharply-defined red plaques, which can be shiny and with very little scales on skin folds. The diagnosis is most often made based on the presence of typical erythemo-squamous psoriasiform papules and plaques on different body parts — scalp, elbows, knees, sacral part of the back, hands, feet, genitals; with typical changes on the nail plates in the form of tiny dents, yellowish spots and thickening of the nail plates. Therapy is carried out according to a dermatologist’s recommendation.
In a much smaller number of cases, lesions in the skin folds may be due to some other conditions, such as: Darier disease, zinc deficiency, Hailey-Hailey disease, granular parakeratosis, Langerhans cell histiocytosis, Extramammary Paget disease or cutaneous Cron’s disease.