SKIN INFECTION Flashcards
Flat lesions charcterized by change in color of the affected skin.
MACULES
Raised lesions, solid in consistency of less than 5 mm in diameter
PAPULES
Flat with elevated surface ( plateau-like) with more than 5 mm diameter
PLAQUES
Rounded raised lesions more than 5 mm in diameter
NODULES
Annular or ring like papules or plaques with pinkish color
URTICARIA ( wheals or hives)
Circumscribed fluid-filled lesions less than 5mmin diameter
VESICLES
circumscribed fluid-filled lesions more than 5mm in diameter
BULLAE
Circumscribed, exudate-filled lesions
PUSTULES
Skin lesions due to bleeding into the skin.
PURPURA
a.Petechiae - less than 3 mm diameter
b.Ecchymosis - more than 3 mm diameter
Crater- like lesion thay may involve the deeper layers of the epidermis and dermis
ULCER
Necrotic ulcer covered with a blackened scab or crust
ESCHAR
A pyogenic (pus-producing) infection involving the hair follicle. It is charavterized by localized painful inflammation and heals rapidly after draining the pus.
FOLLICULITIS
An extension of folliculitis and also known as boil. It is characterized by LARGER AND PAINFUL NODULES with underlying collection of dead and necrotic tissue.
FURUNCLE
Represents a coalescence of furuncles that extends into the subcutanueous tissue with multiple sinus tracts.
CARBUNCLE
Folliculitis occuring at the base of the eyelids
STY OR HORDEOLUM
Common in children. Primarily involves the face and the limbs. Starts as macule, then becomes a pus-filled vesicle that ruptures and forms crust(honey colored crust)
IMPETIGO
Part of the normal flora of the skin and commonly associated with “stitch abscess”, UTI, and Endocarditis. Causes infections in individuals with prosthetic devices.
STAPHYLOCOCCUS EPIDERMIS
Gram stain of samples of infected tissue will show gram- positive cocci in pairs and chains associated with leukocytes
MICROSCOPY
Positive beta hemolysis in blood agar.
CULTURE
Antibiotic susceptibility test with (+) zone of inhibition of growth around the bacitracin disc.
BASITRACIN TEST
Capable of producing water- soluble pigments. An opportunistic pathogen, a common cause of nosocomial infections(hospital-acquired) and resistant to most antibiotics.
PSEDOMONAS AERUGINOSA
Warts are caused by a DNA virus, the
HUMAN PAPILLOMAVIRUS
HPV is acquired by?
- Direct contact through mucosal or skin breaks.
2.sexual contact.
3.passage through infected birth canal.
Benign, self limiting proliferation of the skin that undergoes spontaneous resolution.
SKIN WARTS
Also known as condylomata acuminata
GENITAL AND ANOGENITAL WARTS
Treatment for Warts is by removal of the lesion by:
1.surgical excision
2.cryosurgery
3.electrocautery
4.application of caustic agents
Etiologic agents for Herpes Simples Infections
Herpes Simples Virus ( HSV) Types 1 and 2, (herpesviridae)
Herpes Simplex Virus can be transmittef through:
1.oral contact ( kissing)
2.fomites (sharing of glasses, toothbrushes)
3.sexual contact
4.transplacental ( during pregnancy) (during childbirth)
Primary infection, primarily caused by HSV-1. Presents as vesicles that rupture and ulcerate. Seen in the buccal mucosa, palate, gingivae, pharynx, and the tongue. GINGIVITIS. Common furing childhood.
GINGIVOSTOMATITIS
Caused by HSV-1 and HSV 2. Usually located at the vermillion boarders of the lips.
HERPES LABIALIS ( fever blister or cold sore)
HSV infection involving the fingers and caused by both HSV types 1 and 2.
HERPETIC WHITLOW
HSV Infection occuring in children with eczema.
ECZEMA HERPETICUM
HSV infection of the body and is usually acquired during wrestling or playing rugby.
HERPES GLADIATORUM
Skin infections may be caused by a variety of infectious agents such as:
Bacteria, Viruses, Fungi
A common cause of stitch abscess.
STAPHYLOCOCCUS EPIDERMIDIS
Grape-like clusters
Staphylococcus aureus
Treatment choice for Staphylococcus aureus
BETA-LACTAM ANTIBIOTICS such as “Penicillin”
Part of the normal flora of the skin and commonly associated with “stitch abscess” ,UTI, and endocarditis
STAPHYLOCOCCUS EPIDERMIDIS
Pyoderma
Impetigo - lesions rupture and form honey-colored crusts
Clinical findings for STREPTOCOCCUS PYOGENES
1.impetigo
2.erysipelas
3.cellulitis
4.necrotizing fasciitis