Integumentary

General Introduction to Skin Disorders and Assessment

• Definition of Skin Infections: These occur when harmful microorganisms (bacteria, viruses, fungi, or parasites) invade the skin, resulting in redness, swelling, pain, inflammation, and potential discharge or pus formation.
• Nursing Assessment Components:
  • History: Includes onset, duration, progression of symptoms, pain, itching, shaving habits, clothing preferences (tight vs. loose), exposure to hot tubs/pools, and previous infection history.
  • Physical Examination: Inspection for redness, swelling, tenderness, pain, and the presence of pustules or abscesses.
  • Diagnostic Evaluation:
    • Culture & Gram Staining: Swabs from infected areas to identify causative organisms and select appropriate antibiotics.
    • Blood Tests: Complete Blood Count ($CBC$), including Total Leukocyte Count ($TLC \uparrow$) and Erythrocyte Sedimentation Rate ($ESR \uparrow$). Blood sugar assessment is critical for those with suspected underlying conditions like diabetes.

Bacterial Skin Infections

• Etiology: Primarily caused by $Staphylococcus$ and $Streptococcus$ species entering through cuts, abrasions, hair follicles, or other openings.
• Primary Types of Folliculitis (Causative Agents):
  1. Staphylococcal Folliculitis: Caused by $Staphylococcus \, aureus$; characterized by small red or white pus-filled pimples.
  2. Pseudomonas (Hot Tub) Folliculitis: Caused by $Pseudomonas \, aeruginosa$; contracted from contaminated hot tubs or pools.
  3. Malassezia (Pityrosporum) Folliculitis: Caused by $Malassezia$ yeast; produces itchy red or pus-filled acne-like lesions.
  4. Gram-negative Folliculitis: Associated with long-term antibiotic use.
  5. Eosinophilic Folliculitis: Non-infectious; seen in $HIV/AIDS$ and immunocompromised patients.
  6. Barber's Folliculitis: Infection associated with shaving or haircuts (razor/clipper use).
  7. Viral Folliculitis: Caused by $Herpes \, simplex$ or $Varicella-zoster$; results in painful fluid-filled blisters.
• Folliculitis vs. Furuncles (Boils):
  • Folliculitis: Superficial or deep infection/inflammation of hair follicles, usually $S. \, aureus$.
  • Furuncle (Boil): Deep, painful, pus-filled infection of a hair follicle extending into surrounding tissues.
  • Clinical Manifestations: Small pink bumps, white/yellow pustules, pruritic papules, warmth, and potentially systemic symptoms like fever, malaise, and chills.
  • Management:
    • Medical: Systemic antibiotics (Cephalosporins, Dicloxacillin, Trimethoprim-Sulfamethoxazole) and topical agents (Mupirocin, Erythromycin, Benzoyl peroxide).
    • Surgical: Incision and Drainage (I&D) for localized abscesses; excision for chronic lesions; laser hair removal for recurrence.
    • Nursing Care: Apply warm compresses to promote drainage; maintain hand hygiene; prevent scratching or squeezing lesions.

Carbuncles (Abscesses)

• Definition: A painful, large cluster of boils (furuncles) originating from multiple hair follicles, forming interconnected abscesses with multiple openings.
• Etiology: Primarily $Staphylococcus \, aureus$.
• Common Sites: Back, neck, and thighs.
• Pathophysiology: Bacterial entry $\rightarrow$ Folliculitis $\rightarrow$ Furuncle $\rightarrow$ Infection spreads to adjacent follicles via sinus tracts (tunneling) $\rightarrow$ Carbuncle.
• Distinction from Furuncle:
  • Furuncle: Single follicle, less deep, rare systemic symptoms, heals in $2-3 \, weeks$.
  • Carbuncle: Multiple follicles, deeper, common systemic symptoms (fever, chills), multiple drainage openings, takes longer to heal.
• Management:
  • Medical: Oral antibiotics (Non-$MRSA$: Dicloxacillin, Cephalexin; $MRSA$: Clindamycin, Doxycycline). IV antibiotics (Vancomycin, Linezolid) for severe cases.
  • Surgical: I&D, Excision, Debridement (removal of necrotic tissue), and Saucerization (creating a shallow depression for drainage).

Viral Skin Infections

• Herpes Zoster (Shingles):
  • Definition: Reactivation of the $Varicella-Zoster \, Virus \, (VZV)$ which lies dormant in sensory nerve ganglia (Dorsal Root Ganglia).
  • Risk Factors: Age $> 50 \, years$, immunosuppression ($HIV$, cancer), and physical/emotional stress.
  • Stages:
    1. Prodromal: Burning, tingling, sharp pain, fever, fatigue.
    2. Rash (Days 1-5): Red rash along a dermatome; papules $\rightarrow$ vesicles $\rightarrow$ pustules.
    3. Late (Days 7-10): Blisters dry and form crusts/scabs.
  • Management: Antiviral drugs (Valacyclovir