•It is a pyogenic infection of the whole hair follicles • causative organism : staph aureus •Sex and age :males after puberty •Site : beard and moustache •Morphology : discrete , erythematous follicular papules or pustules from which hair emerge perifollicular edema • Course : chronic with remission and relapses .

Sycosis vulgaris

Differential diagnosis :1. Taenia barbae 2. Psudo-folliculitis 3. Herpes simplex 4. Impetigo Treatment :a. Local :- Local compresses - Local antibiotic on the beard and nose b. General : - Cloxacillin ( anti- staph )

Def : superficial mild chronic infection of the skinEtiology : coryneobactrium minutissimum Site : feet, groins, axillae, and submammary areas,

which mimics epidermal dermatophyte infectionsPredisposing factor : 1. Obisity , DM 2. occlusive clothing/shoes3. Anaemia 4. Hyperhydrosis 5. Increased humidity

Erythrasma (Greek, "red spot")

Clinical picture : Subjective symptoms :- Non - itchy disfigurement - Mild irritation in the grion Morphology : - Dry , slightly scaly yellowish brown patches with sharply

defined irregular border - The border is not active Localization : Flexures , axillae , inner aspect of the thighs , umbilicus Anal cleft , under the beast in obese females Bilatral

Erythrasma: groins Sharply marginated, brownish-red, slightly scaling macular patch on the medial thigh (infectious intertrigo) appears bright coral-red when examined with a Wood's lamp.

Erythrasma: webspace This macerated interdigital webspace The webspace is the most common site for erythrasma in temperate climates

DD :

1. intertrigo 2. Pitryasis versicolar 3. Taenia cruris : erythematous scaly

patch with active border 4. Seborrheic dermatitis 5. Psoriasis 6. Candidal dermatitis

Laboratory ExaminationsWood's Lamp demonstration of the characteristic coral-red

fluorescenceDirect MicroscopyNegative for fungal forms on KOH preparation of skin

scraping. In the webspaces of the feet, concomitant interdigital tinea pedis may also be present. Gram or Giemsa stains may show fine bacterial filaments.

Bacterial CultureHeavy growth of Corynebacterium. Staph aureus, group A

strep, and Candida infection. In some cases, concomitant Pseudomonas aeruginosa

webspace infection (feet) is also present.DiagnosisClinical findings, absence of fungi on direct microscopy,

positive Wood's lamp examination.

Treatment : General : Erythromycin 1gm daily for 2w , Local : local antifungal : e g Tolnaftate twice daily for 2-3w Imidazole derivative cream twice daily for 2-

3w Sodium fusidate ointment,Benzoyl peroxide (2.5%) gel daily after

showering for 7 days

(PK) presents as defects in the thickly keratinized skin of the plantar foot with eroded pits of variable depth, caused by Kytococcus sedentarius.

Age Young adults & Sex Males > femalesPredisposing Factors as erythrasma K. sedentarius produces proteases which digest keratin.Skin SymptomsUsually asymptomatic. Foot odor, sliminess of feet.

Uncommonly, itching, burning, tenderness. Often mistaken for tinea pedis.Skin Lesions Crater-like pits in stratum corneum Involved areas are white when stratum corneum is fully

hydrated Symmetric or asymmetric involvement of both feet

Pitted Keratolysis (Keratolysis Sulcata)

Pitted keratolysis: plantar

The stratum corneum shows loss of

keratinization with well-dermarcated margins,

Pitted keratolysis: toe Pitted epidermis of an intertriginous toe, associated with

hyperhidrosis

Def :abscess is an acute or chronic localized

inflammation, associated with a collection of pus and tissue destruction

A furuncle is an acute, deep-seated, red, hot, tender nodule or abscess that evolves from a staphylococcal folliculitis

A carbuncle is a deeper infection composed of interconnecting abscesses usually arising in several contiguous hair follicles.

Abscess, Furuncle, and Carbuncle

Etiology :Causative organism : staph aureusPredisposing factors: 1. Pressure ,friction ,irritation of skin in exposed

areas and extensor surface 2. Chronic S. aureus carrier state (nares, axillae,

perineum, vagina) 3. Diabetes mellitus Obesity 4. Poor hygiene & Bactericidal defects (e.g.,

chronic granulomatous disease) 5. Chemotactic defects 6. Hyper-IgE syndrome (Job's syndrome) 7. HIV disease, especially MRSA infection

Clinical picture : Morphology :- Perifollicular , tender , hot nodules with

erythematous surface within few days transformed into necrotic core (remnant of hair follicle )

Localization affect area contain hair follicles : face , neck , back , axilla , arms and anorectal

region Symptoms :1. The lesion is painfull , throbbing pain . 2. Fever , mild constitutional symptoms 3. Carbuncles may be accompanied by low-grade

fever and malaise.

Furuncle: S. aureus Soft-tissue swelling of the forehead with

central abscess formation, nearing

rupture

Furuncles: S. aureus Multiple

areas of folliculitis in the moustache

extending to become furuncles

Multiple furuncles: Multiple, painful ulcerated nodules on the buttocks of a 20-year-old male, occurring during hospitalization for ulcerative colitis.

Carbuncle: S. aureus A very large, inflammatory plaque with pustules, on the neck. Infection extends down to the fascia and has formed from a confluence of many furuncles.

DD : 1. Acne vulgaris 2. Bockhart impetigo 3. Herpes simplex 4. Sweat rash Treatment : 5. Local measures : - hot compressing - pirecing the pointed surface to discharging pus - cleaning the area by local antibiotic - a void occlusive dressing 2. General : antibiotic as penicillin & flucloxacillin .

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