Favus is a fungal infection of the scalp that is caused by the fungus Trichophyton schoenleinii. It is characterized by scaly, yellowish-white patches on the scalp that can become crusted and form a ring-like pattern. The term favus comes from the Latin word for 'honeycomb, ' which is an apt description of the lesions. Treatment typically involves antifungal medications and topical creams. The crossword solutions for the term favus are TILE, which is an appropriate description of the lesions.