Lecture 5Common Skin Infections

Marcella Debeck

Common Skin Infections

Impetigo Ecthyma Folliculitis Erysipelas Necrotising fasciitis Erythrasma Pitted Keratolysis Cellulitis onychomycosis

Lymphaginitis Molloscum Contagiosum Verrucae Herpes simplex Herpes zoster Dermatophyte infections candida albican infection

Impetigo

Superficial skin infection due to staphylococci or streptococci

infections Contagious blisters which rupture leaving yellow

crusted exudate Two types

Bullous Impetigo

Ecthyma

Strep. Or Staph. Infection circumscribed, ulcerated and crusted lesions heal with scarring mostly in legs

Ecthyma

Folliculitis

Infection of the hair follicles any hairy area

Erysipelas

Dermal infection May be accompanied by systemic

symptoms - malaise, shivering, fever well defined advancing edge AKA St Anthony’s fire

Erysipelas

Necrotising fascitis

very serious bacterial infection of the superficial fascia progresses very quickly

Erythrasma

Dry, reddish brown, slightly scaly and asymptomatic eruption

wood’s light - coral-pink imidazole cream, oral ab’s, fusidic acid Toe webs

Dockery, G.L. (1997).Cutaneous Disorders of the lower extremity. Phila

delphia:WB Saunders

Slide 2

Pitted Keratolysis

maloderous, pitted erosions and discoloured areas.

cornebacterium

Cellulitis

Infection of the subcutaneous tissues deeper and more extensive than erysipelas systemic symptoms swelling, redness, and local pain antibiotics

Lymphaginitis

inflammation of the lymph vessels appearance of a red line that follows the blood vessels up the leg

Lymphadenitis - inflammation of the lymph nodes

Molluscum contagiosum

discrete pearly, pink, umbilicated dome shaped papules

DNA pox virus contain a cheesy material face, neck and trunk usually multiple and grouped

Verrucae Vs Corns

Rapid Onset Slow growing

Any site Sites of compressionand friction

Young Middle aged and older

Superficialcappillaries whichbleed easily

Capillary bleeding israre

Herpes Simplex

Acute vesicular eruption two virus types reoccurence Differential diagnosis: impetigo

Herpes

Dockery, G.L. (1997).Cutaneous Disorders of the lower extremity. Philadelphia:WB Saunders

Slide 3

Herpes Zoster

Varicella zoster virus Dermatomal distribution Post herpetic neuralgia rest, analgesia, drying lotions acyclovar and prednisone

Gawkrodger, D. J. (1992) Dermatology. London: Churchill Livingstone

Slide 7

Dermatophyte infections

Microsporum Trichopyton Epidermophyton Form hyphae Tinea Pedis: T.rubrum, Tmentagrophytes

var interdigitale, Epidermophyton floccosum

Dermatophyte infections

Differential diagnosis:– Psoriasis– Contact dermatitis– erythrasma

Tinea pedis

Interdigital moccasin acute vesicular

Interdigital tinea pedis

Gawkrodger, D. J. (1992) Dermatology. London: Churchill Livingstone

Slide 3

Tinea pedis

Candida albicans infections

yeasts intertrigo paronychia Differential diagnosis (intertrigo)

– Psoriasis, seborrhoeic dermatitis, bacterial seconadary infection

Differential diagnosis (Paronychia):– bacterial infection, chronic eczema:

Dockery, G.L. (1997).Cutaneous Disorders of the lower extremity. Philadelphia:WB Saunders

Slide 1

Candida Paronychia

Onychomycosis

Fungal Infection of the nails generally dermatophyte occasionally mould or candiida Four types:

– distal and lateral subungual– superficial white– proximal subungual– total dystrophic

Gawkrodger, D. J. (1992) Dermatology. London: Churchill Livingstone

Slide 7