A fungus infection (dermatophytosis) of the keratin component of hair, skin, or nails. Genera of fungi causing such infection are Microsporum, Trichophyton, and Epidermophyton. SYN: ringworm, serpigo (1). [L. worm, moth]
- t. barbae a fungus infection of the beard, occurring as a follicular infection or as a granulomatous lesion; the primary lesions are papules and pustules. SYN: barber itch, folliculitis barbae, ringworm of beard, t. sycosis.
- t. capitis a common form of fungus infection of the scalp caused by various species of Microsporum and Trichophyton on or within hair shafts, occurring most commonly in children and characterized by irregularly placed and variously sized patches of apparent baldness because of hairs breaking off at the surface of the scalp, scaling, black dots (see black-dot ringworm), and occasionally erythema and pyoderma. SYN: ringworm of scalp.
- t. circinata SYN: t. corporis.
- t. corporis a well-defined, scaling, macular eruption of dermatophytosis that frequently forms annular lesions and may appear on any part of the body. SYN: ringworm of body, t. circinata.
- t. favosa SYN: favus.
- t. imbricata an eruption consisting of a number of concentric rings of overlapping scales forming papulosquamous patches scattered over the body; it occurs in tropical climates and is caused by the fungus Trichophyton concentricum. SYN: Oriental ringworm, scaly ringworm, Tokelau ringworm.
- t. kerion an inflammatory fungus infection of the scalp and beard, marked by pustules and a boggy infiltration of the surrounding parts; most commonly caused by Microsporum audouinii.
- t. manus ringworm of the hand, usually referring to infections of the palmar surface. SEE ALSO: t. corporis.
- t. nigra a fungus infection due to Exophiala werneckii, marked by dark lesions giving a spattered appearance and occurring most commonly on the palms of the hands. SYN: pityriasis nigra.
- t. pedis dermatophytosis of the feet, especially of the skin between the toes, caused by one of the dermatophytes, usually a species of Trichophyton or Epidermophyton; the disease consists of small vesicles, fissures, scaling, maceration, and eroded areas between the toes and on the plantar surface of the foot; other skin areas may be involved. SYN: athlete's foot, dermatomycosis pedis, ringworm of foot.
- t. tonsurans t. capitis or t. corporis caused by the fungus Trichophyton tonsurans; characterized by small plaques and fewer broken off hairs than in t. capitis caused by other species.
- t. unguium ringworm of the nails due to a dermatophyte.
- t. versicolor an eruption of tan or brown branny patches on the skin of the trunk, often appearing white, in contrast with hyperpigmented skin after exposure to the summer sun; caused by growth of the fungus Malassezia furfur in the stratum corneum with minimal inflammatory reaction. SYN: pityriasis versicolor.
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tin·ea (tinґe-ə) [L. “grub,†“moth larva,†“wormâ€] any of various dermatophytoses of humans, usually designated by a modifying term depending on appearance of lesions, etiologic agent, or site. Popularly called ringworm.Medical dictionary. 2011.