A severe, unremitting type of chronic ringworm of the scalp and nails, with scarring and formation of crusts called scutula, caused by three dissimilar dermatophytes, Trichophyton schoenleinii (most commonly), T. violaceum, and Microsporum gypseum; it occurs more frequently in the Mediterranean countries, southeastern Europe, southern Asia, and northern Africa. SYN: crusted ringworm, honeycomb ringworm, tinea favosa, witkop. [L. honeycomb]