-IBIS-1.5.0-
tx
cutaneous system
tinea/ringworm
diagnoses

definition and etiology

definition:
superficial infection of the hair, skin, or nails caused by dermatophytes (fungi which invade non-living tissues of the body, e.g. superficial skin, hair, nails)

etiology:
usually classified by the area of the body affected rather than the associated microorganism

signs and symptoms

signs and symptoms: Fungal infections are often very low-grade and cause occasional scaling of the superficial dermis. Other infections cause acute reactions such as:
• bulbous, vesicular lesions (common in the feet)
• tinea unguium (toenails) causes nails to become thickened, with debris forming under the free edge
• tinea capitis

lab findings:
• skin scraping with KOH examination to confirm presence of fungus
• skin scrapings may also be cultured for fungus
• fluorescence under Wood's lamp is suggestive but not diagnostic

course and prognosis

Cutaneous fungal infections are common and easily treated using conventional or alternative antifungal preparations. However, these infections tend to recur in susceptible hosts, and require nonpharmacological constitutional treatment to diminish susceptibility. Secondary infections are occasionally troublesome, especially in the groin area.

differential diagnosis

• tinea pedis (athlete's foot)
• tinea capitis (scalp)
• tinea cruris (jock itch)
• other skin conditions including candidiasis, eczema, psoriasis, impetigo, pityriasis rosea, syphilis, drug reactions


footnotes