A fungal infection of the nail, usually caused by dermatophytes; yeasts; or nondermatophyte molds. The disease is tinea unguium (MONDO_0001628). Also known as: cellulitis and abscess of buttock, cellulitis and abscess of face, cellulitis and abscess of finger, cellulitis and abscess of finger and toe, cellulitis and abscess of gluteal region, cellulitis and abscess of trunk, cellulitis and abscess of upper arm and forearm, dermatophytic onychia.