Eczema

 Eczema, also known as atopic dermatitis, is a chronic inflammatory skin disease characterized by itching, redness, dryness, and cracking. Eczema can occur in people of all ages, but is most common in children. Eczema often occurs in cycles, with flare-ups and remissions. 

Types of Eczema :

1. Atopic Dermatitis: 

• most common eczema, associated with allergies, asthma or hay fever.

2. Contact Dermatitis: -

• Irritant Contact Dermatitis: caused by direct skin contact with an irritant (soap, chemical, etc.).
• Allergic contact dermatitis: caused by allergic reactions to substances such as nickel, perfumes, poison ivy, etc.

3. Dyshidrotic eczema: small itchy blisters on the hands and feet.

4.Coinoid eczema: mostly on legs, arms, or torso, 

5. Seborrheic dermatitis: scaly, greasy patches on the scalp, face, or chest;

 6. Stasis dermatitis: stasis dermatitis: occurs on the lower extremities due to poor circulation and fluid buildup; 

causes :

 The exact cause of eczema is unknown, but a combination of genetic, environmental, and immune factors are involved. Common triggers include:

• Irritants Irritants: soaps, detergents, fragrances, or certain fabrics.
• Allergens Allergens: pollen, dust mites, pet dander, or certain foods. 
• Environmental factors: cold, heat, humidity. 
• Stress: Can aggravate symptoms.
• Heredity: Family history of eczema, asthma, or hay fever increases risk.
• Immune system dysfunction: overreaction to external stimuli. 

Symptoms - 

Itching: often intense, especially at night. 

Red or brownish-gray spots: often on hands, feet, ankles, wrists, neck, upper chest, eyelids, elbows, or inner knees.

Dry, cracked skin: may bleed or fester.

Thickened skin: from prolonged scratching or friction.

Liquid-filled blisters: may ooze and crust over. 

Diagnosis:

• Eczema is usually diagnosed by: Based on the appearance of the skin. 
• Medical history: includes allergies, asthma, family history of eczema. 
• Patch test: identifies specific allergens if contact dermatitis is suspected. 
• Skin biopsy: In rare cases, to rule out other conditions. 

 Treatment:

There is no cure for eczema, but treatment is aimed at managing symptoms and preventing flare-ups:

 1. Topical treatment: 

• Moisturizers (emollients): keep skin moist and protect barrier function. 
•  Corticosteroid creams or ointments: reduce inflammation and itching. 
• Calcineurin inhibitors(e.g., tacrolimus, pimecrolimus): for sensitive areas such as the face.

2. Oral medications: - 

• Antihistamines: for nighttime itching;
• Systemic corticosteroids:Used for severe flare-ups. 
• Immunosuppressants(e.g., cyclosporine, methotrexate): for severe, refractory eczema.

3 Biological therapies: -

 

• Dupilumab (Dupixent): monoclonal antibody for moderate to severe atopic dermatitis.

4 Lifestyle and home therapy: -

 

• Warm bath: after warm bath, Apply moisturizer immediately after warm bath. 
• Wet wrap therapy: After applying the medication, wrap the skin with a wet bandage. -
•  Avoid triggers: Identify and eliminate allergens and irritants. 

5. Phototherapy: - 

•  Controlled exposure to ultraviolet light. 

 Complications :

•  Infections: - Scratching and skin breakage can lead to bacterial, viral,   and fungal infections. 
• Chronic itching and scratching: can lead to lichenification (thickened, leathery skin). 
• Sleep disturbances: Severe itching may affect sleep. 
• Psychological effects: stress, anxiety, depression. 

Prevention :

• 1. Regular moisturizing: use a thick cream or ointment after bathing;
• 2. Avoid harsh soaps and detergents: use fragrance-free, non-irritating products; 
• 3. Wear soft, breathable fabrics: cotton, etc.; 
• 4. Stress management: practice relaxation techniques such as yoga and meditation;
• 5. Allergy management: avoid allergens and keep living conditions free of dust mites and pet dander; 

prognosis:

• Many children will outgrow eczema by puberty, but others will experience periodic recurrences throughout their lives.  
• With proper treatment and prevention strategies, most can effectively manage their symptoms and lead comfortable lives.

The human papillomavirus (HPV)

The human papillomavirus (HPV) is a group of more than 200 related viruses, most of which are sexually transmitted; some types of HPV cause warts (papillomas) on different parts of the body, while others cause cancer, especially in the cervix, anus, oropharynx and genitals HPV is one of the most common sexually transmitted infections (STIs) worldwide. 

Types of HPV :

 1. Low-risk HPV: - 

• Causes warts (e.g. genital warts and warts vulgaris). 
•  It does not cause cancer.  
• Examples: HPV types 6 and 11 (cause of most genital warts);

 2. High-risk HPV: - 

• Associated with the development of cancer.
• Persistent infection with these types can lead to precancerous changes and cancer. 
• Examples: e.g. HPV types 16 and 18 (cause of cervical cancer and most other HPV-related cancers).

 Symptoms of HPV 

1. Warts: - 

• Genital warts: soft, fleshy growths on the genitals, anus or around the mouth.
• Common warts: hard, raised bumps, usually on the hands or fingers. 
• Plantar warts: hard, granular growths on the soles of the feet. 
• Flat warts: slightly raised, smooth growths, usually on the face or feet; 

2. Pre-cancerous changes: -

•  detected by screening (e.g. Pap smear or HPV test). 
•  Found on the cervix, anus, pharynx, etc.

3. Symptoms of cancer (advanced stages): - 

• abnormal bleeding or discharge (e.g. vaginal bleeding). 
• Pain during sexual intercourse or urination. 
• Persistent sore throat or hoarseness (cancer of the middle pharynx). 
• Lumps or swelling in the affected area. 

Transmission

• Infection HPV is spread through direct skin-to-skin contact, such as  Vaginal, anal or oral sex. 
•  Close contact with infected skin or mucous membranes. 
•  Rarely, HPV can be transmitted from mother to baby during birth, even if the infected person has no visible signs or symptoms.

 Diagnosis :

1.For warts: - 

• Visual examination by a health professional.

2. For Cervical HPV infection: - 

• Pap smear: detects abnormal cervical cells.
• HPV test: confirms the presence of high-risk HPV. 
• Colposcopy: examines abnormal areas using a special microscope.

3. For other HPV-related disease: - 

• Biopsy of suspicious lesions or warts. 
•  Imaging studies of HPV-related cancers. 

 Treatment :

There is no treatment for HPV itself, but its symptoms and complications can be addressed: -

•  Topical treatment: salicylic acid, podophyllin or imiquimod. 
• Cryotherapy: freezing the warts with liquid nitrogen.
•  Surgical excision or laser treatment for stubborn warts;

 2. Precancerous changes: -

•  procedures such as cryotherapy, loop electrosurgical excision (LEEP) and conical excision to remove abnormal cells.

3.Cancer: -

•  Treatment depends on the type and stage of cancer and may include surgery, radiotherapy, chemotherapy and immunotherapy. 

 Prevention :

1. Vaccination: -

HPV vaccine (Gardasil 9): - 

• Protects against the most common cancer-causing HPV types (types 16 and 18) and the types that cause genital warts (types 6 and 11). 
•  Recommended for :
•        boys and girls aged 11-12 years (vaccination can be given from              age              9). 
•         Catch-up vaccination up to 26 years of age.
•         Some adults aged 27-45 years, after consultation with a health             professional.

2. Safe sexual practices: - 

• Use condoms or dental dams during sexual activity. 
•  Limit the number of sexual partners.

3. Regular check-ups: - 

•  Pap smear: Start at age 21 and continue as recommended in guidelines. 
•  HPV testing: For women over 30, usually combined with Pap smear.

4. Lifestyle measure: - 

• Avoid tobacco use as it increases the risk of HPV-related cancer. 
• Maintain a healthy immune system through a balanced diet and regular exercise. 

 Complications of HPV

 1. Genital warts: - 

• can recur even after treatment;

 Cancer: - 

• cervical cancer is the most common cancer associated with HPV.
•   Other affected sites include the anus, vulva, vagina, penis and oropharynx (throat and mouth).

3. Psychological outcomes: -

• Stigmatization and anxiety associated with the diagnosis. 
• Most HPV infections are cleared by the immune system within 1-2 years and do not cause problems.
• Persistent infection with high-risk HPV types can lead to precancerous changes and cancer if left untreated.
• Regular vaccination and screening can significantly reduce the burden of HPV-related disease.

Varicella-Zoster virus (VZV)

 Varicella-Zoster virus (VZV) is a member of the herpesvirus family and causes two distinct diseases: Varicella (chickenpox) occurs during primary infection and herpes zoster (shingles) during reactivation. After initial infection, the virus remains dormant in the ganglia and may reactivate later in life, especially if the immune system is weakened.

 Diseases caused by VZV  :

 1. Chickenpox (Varicella): - 

• A highly contagious disease characterized by itchy rash, fever, and malaise.
• Most common in children, but adults may also develop the disease, which tends to be severe.
• Transmitted by respiratory droplets or direct contact with lesions.

 2. Herpes Zoster: -

• Caused by reactivation of dormant VZV. - 
• It is characterized by a painful localized rash along a single neurocutaneous segment.
• Risk increases with age or immunosuppression.

  sypmtoms :

   Chickenpox: 

•  Fever, fatigue, malaise.
•  Rash :

•     Begins as red spots and progresses to fluid-filled blisters (vesicles) and scabs.
•      Lesions often form “papules” with new lesions forming as the old lesions heal. 
•     Usually begins on the trunk and spreads to the face, arms, and legs.

 Shingles: -

•  Pain, burning, or tingling (prodrome) in a specific area.
•  Rash: -

        Red spots that develop into fluid-filled blisters. - Localized to one side of the body along the nerve pathways (dermatome).

 Other symptoms: - 

•       Headache, fever, malaise. 
•       Persistent nerve pain (postherpetic neuralgia) may follow the rash.

Transmission:

  Chickenpox : -

 

•     Highly contagious from 1 to 2 days before the rash appears until all      lesions crust over. 
•    Transmitted by respiratory droplets or direct contact with vesicle          fluid.

  Shingles: -

•  Not as contagious as chickenpox. 
• Direct contact with vesicular fluid from shingles can cause chickenpox in persons who have never had chickenpox or have not been vaccinated.

 Complications

1. Chickenpox: - 

•  Bacterial skin infection.
•  Pneumonia (especially in adults). 
•  Encephalitis or cerebellar ataxia.
•  If infected during pregnancy, congenital varicella syndrome.

 2. Herpes zoster: - 

• Postherpetic neuralgia (PHN): 
• nerve pain that persists after the rash has disappeared. 
• Sight loss (if ocular nerves are involved).
• Secondary bacterial infections. 
• Neurologic complications such as meningitis or myelitis. 

Diagnosis

•   Clinical manifestations:

            typical rash pattern and distribution. 

 Laboratory tests: -

•  PCR: detects VZV DNA (highly sensitive).
•  Direct Fluorescent Antibody (DFA): Identifies virus in lesion samples.
•  Serology: Detect VZV antibodies to confirm the presence or absence of exposure.

 Treatment 

1. Chickenpox -

• supportive care

• Antihistamines for itching.
• Acetaminophen for fever (avoid aspirin to prevent Reye's syndrome). 
• Antiviral therapy (e.g., aciclovir) in severe cases, adults, and immunocompromised individuals;

 2. Herpes zoster: -

• Antivirals (e.g., aciclovir, valacyclovir, or famciclovir) to reduce    severity  and duration of illness.
• Pain management: 

• Over-the-counter or prescription analgesics for severe pain.
• Topical lidocaine or capsaicin cream for localized pain.
• Corticosteroids (in some cases) to reduce inflammation.

 vaccinations:

 1. Chickenpox Vaccine(Varicella vaccine): 

•   A live attenuated vaccine given twice in childhood.
•   Highly effective in preventing or reducing the severity of chickenpox

.2. Herpes zoster vaccine 

•  Shingrix (genetically modified vaccine): - Recommended for adults over 50 years of age or those with compromised immunity. 
•  Significantly reduces the risk of herpes zoster and postherpetic neuralgia. 

 Prevention:

• Vaccination is the most effective way to prevent VZV-related diseases.
• Avoid contact with infected persons, especially if immunocompromised or unvaccinated. - 
• Proper hygiene and covering lesions can help reduce the spread of the virus. 

 Prognosis:

• Chickenpox: generally mild in healthy children, but may cause complications in adults and immunocompromised patients.
• Herpes zoster: pain and rash usually resolve in 2-4 weeks, but postherpetic neuralgia may persist, especially in the elderly. 

With timely treatment and vaccination, VZV-related outcomes are markedly improved and complications are reduced.