Especially tinea faciei which is an uncommon dermatophytosis affecting the glabrous skin of the face that is frequently misdiagnosed, especially the forms whose appearance has been modified by inappropriate treatment usually by a topical steroid leading to the so-called tinea incognita where the diagnosis is often difficult (Fig. 23.2). One specific form known as tinea pseudoimbricata starts with central erythematous, scaly, pruritic plaques from which one to three centrifugally spreading, concentric circles emerge (Fig. 23.3). The clinical manifestation is called tinea pseudoimbricata because of its resemblance to the infection typically caused by Trichophyton concentricum [1, 2].

Profuse or extensive dermatophytosis in any body location. Therefore, when examining patients with profuse mycosis (Figs. 23.4 and 23.5), one should always inquire about the topical treatments used by the patient.

Crusted scabies: the unrestricted and inappropriate use of topical corticosteroids in some cases of undiagnosed scabies, especially in infants, may lead to the severe form which is called crusted scabies (Fig. 23.6) [3].

Acneiform eruptions are the most frequent complications of abuse of TCS. These include the following:

Erysipelas: in Africa, TCS are used to bleach the skin, and many cases of erysipelas were reported after the use of topical corticosteroids. Corticosteroids potentiate the skin penetration of the bacterial pathogen causing erysipelas (Fig. 23.10) [6].