Tinea incognito with intrafamilial outbreak caused by Microsporum canis

A 2-year-old boy presented with extensive skin lesions on his scalp, neck, back, and arms, lasting for 5 months. He had been previously diagnosed with psoriasis and had received oral methotrexate, topical corticosteroids, and phototherapy. The lesions waxed and waned, and occasionally worsened. On physical examination, there were widespread figurate, annular or polycyclic patches and plaques with an active scaly border on the face, trunk, and arms (Figure 1, A). There were multiple patches of alopecia with scales and follicular pustules on the scalp (Figure 1, B).

source https://www.jpeds.com/article/S0022-3476(21)01241-5/fulltext?rss=yes