Tinea corporis In some cases, tinea corporis presents with concentric rings (Fig. 6-3). Definitive diagnosis depends on mycologic culture of the scale from a lesion. In cases of candidiasis, tinea imbricata and favus, the causative organism can frequently and confidently be guessed correctly. In general, one may say that Microsporum canis, Microsporum audouinii, T tonsurans, and T schoenleinii can infect scalp and hairless skin, and Trichophyton rubrum and Candida albicans can infect hairless skin and nails.