Lecture 5 Common 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 Antibiotics - topical or systemic carriers - nose, axillae, perineum may be primary or secondary

Bullous Impetigo

Ecthyma Strep. Or Staph. Infection circumscribed, ulcerated and crusted lesions heal with scarring mostly in legs Associated with drug addicts generally insect bite or neglected minor injury ab’s

Ecthyma

Folliculitis Infection of the hair follicles any hairy area Follicul9itis - multiple hair follicles furuncle acute abcess formation\carbuncle - deep abcess formed in a group of follicles associated with obesity, diabetes, occlusion, improved hygiene

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

Slide 2 Dockery, G.L. (1997).Cutaneous Disorders of the lower extremity. Phila delphia:WB Saunders

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

Herpes Simplex Acute vesicular eruption two virus types reoccurence Differential diagnosis: impetigo Type 1 facial/non genital type 2 genital

Herpes

Slide 3 Dockery, G.L. (1997).Cutaneous Disorders of the lower extremity. Philadelphia:WB Saunders

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

Slide 7 Gawkrodger, D. J. (1992) Dermatology. London: Churchill Livingstone

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

Slide 3 Gawkrodger, D. J. (1992) Dermatology. London: Churchill Livingstone

Tinea pedis

Candida albicans infections yeasts intertrigo paronychia Differential diagnosis (intertrigo) Psoriasis, seborrhoeic dermatitis, bacterial seconadary infection Differential diagnosis (Paronychia): bacterial infection, chronic eczema:

Slide 1 Dockery, G.L. (1997).Cutaneous Disorders of the lower extremity. Philadelphia:WB Saunders

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

Slide 7 Gawkrodger, D. J. (1992) Dermatology. London: Churchill Livingstone