Dermatology Overview and Definition

Learn dermatology basics, skin health concepts, and common condition definitions.

Dermatology focuses on the health of the skin, hair, and nails. Learn about the diagnosis and treatment of acne, eczema, skin cancer, and cosmetic procedures.

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Overview and Definition

Dermatology is the branch of medicine and surgery dedicated to the diagnosis, treatment, and prevention of diseases affecting the skin, hair, nails, and mucous membranes. As the skin is the largest and most visible organ of the human body, it serves as the first line of defense against injury and bacteria, as well as a window into the body’s overall health. A Dermatologist is a specialist physician trained to manage over 3,000 different conditions, ranging from cosmetic concerns like wrinkles to life-threatening diseases like melanoma.

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The Anatomy of the Skin

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To understand dermatological conditions, it is necessary to understand the skin’s architecture. It consists of three primary layers, each with specific functions:

  • Epidermis: The thin, outer layer that acts as a waterproof barrier and creates skin tone (via melanocytes). It constantly renews itself.
  • Dermis: The thick, middle layer containing connective tissue, hair follicles, sweat glands, and blood vessels. This layer provides the skin with strength and elasticity (collagen and elastin).
  • Hypodermis (Subcutaneous Tissue): The deepest layer, made of fat and connective tissue, which helps regulate body temperature and cushion internal organs.
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The Scope of Dermatological Practice

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Dermatology is a unique field that blends internal medicine with surgical skills. It is typically divided into three main domains:

  • Medical Dermatology: Focuses on diagnosing and treating skin diseases such as acne, eczema (atopic dermatitis), psoriasis, rosacea, and skin infections. It also involves managing skin manifestations of systemic diseases, such as lupus.
  • Surgical Dermatology: Involves the surgical removal of skin cancers (basal cell carcinoma, squamous cell carcinoma, melanoma) and benign growths like cysts and lipomas. Techniques include standard excision and specialized Mohs Micrographic Surgery.
  • Cosmetic (Aesthetic) Dermatology: Focuses on improving the appearance of the skin, hair, and nails. This includes treatments for aging (botulinum toxin, fillers), scar revision, hair loss, and laser therapies for pigmentation or vascular lesions.
  • Pediatric Dermatology: A sub-specialty dedicated to treating skin conditions specific to infants and children, such as hemangiomas (birthmarks) and genetic skin disorders.

The Vital Role of Skin Health

The skin is an active, living organ. It regulates body temperature, senses the environment, and produces Vitamin D. Disorders of the skin can have profound physical and psychological impacts. Chronic skin conditions like psoriasis or severe acne can affect self-esteem and quality of life, while skin cancers are among the most common malignancies worldwide. Therefore, dermatology is not just about “surface” issues; it is about maintaining the integrity of the body’s protective shield.

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Symptoms and Causes

Skin conditions can present in myriad ways, from subtle color changes to painful lesions. Because the skin is visible, patients often notice symptoms first. However, distinguishing between a harmless rash and a serious disease requires expert evaluation. Recognizing the signs early can prevent permanent scarring or the progression of skin cancer.

Common Symptoms and Warning Signs

Dermatological symptoms are descriptive. Physicians look at the morphology (shape), distribution, and texture of the issue.

  • The “ABCDE” Rule for Moles: This is the critical guide for detecting Melanoma, the deadliest form of skin cancer.
    • A – Asymmetry: One half of the mole does not match the other.
    • B – Border: The edges are irregular, ragged, or blurred.
    • C – Color: The color is not uniform (shades of brown, black, red, or blue).
    • D – Diameter: The spot is larger than 6mm (the size of a pencil eraser).
    • E – Evolving: The mole is changing in size, shape, or color over time.
  • Rashes and Redness (Erythema):
    • Eczema: Dry, itchy, inflamed skin, often inside the elbows or behind the knees.
    • Psoriasis: Thick, red patches covered with silvery scales, typically on elbows, knees, and scalp.
    • Rosacea: Persistent redness, flushing, and visible blood vessels on the face.
    • Urticaria (Hives): Raised, itchy red welts that appear suddenly.
  • Acne and Blemishes:
    • Comedones: Blackheads (open) and whiteheads (closed).
    • Pustules: Red, tender bumps with white pus at the tip.
    • Cysts/Nodules: Deep, painful, fluid-filled lumps under the skin.
  • Changes in Pigmentation:
    • Hyperpigmentation: Dark patches caused by sun damage (melasma) or inflammation.
    • Hypopigmentation: Light patches caused by fungus (tinea versicolor) or loss of pigment cells (vitiligo).
  • Hair and Nail Changes:
    • Alopecia: Patchy or diffuse hair loss.
    • Onychomycosis: Thickened, discolored, or brittle nails indicate fungal infection.
    • Pruritus (Itching): A common symptom that can occur with or without a rash, sometimes indicating dry skin or systemic issues like liver disease.

Underlying Causes of Skin Conditions

The skin reacts to both internal and external factors.

  • Genetics: Many chronic conditions are hereditary. If parents have eczema, psoriasis, or acne, their children are more likely to develop them.
  • Sun Exposure (UV Radiation): The primary cause of premature aging (photoaging) and skin cancer. UV rays damage the DNA in skin cells.
  • Infections:
    • Bacterial: Impetigo, cellulitis, folliculitis (often Staph bacteria).
    • Viral: Warts (HPV), Herpes Simplex (cold sores), Shingles (Varicella-Zoster).
    • Fungal: Athlete’s foot, ringworm, yeast infections.
  • Immune System Dysregulation: In autoimmune diseases such as Lupus or Psoriasis, the immune system mistakenly attacks healthy skin cells, leading to rapid turnover or inflammation.
  • Hormonal Factors: Androgens (male hormones) stimulate oil production, which can lead to acne. Hormonal shifts during pregnancy or menopause can cause melasma or hair thinning.
  • Allergens and Irritants: Contact Dermatitis is caused by the skin coming into contact with a substance it dislikes, such as poison ivy, nickel jewelry, or fragrances in soaps.

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Diagnosis and Staging

Dermatology is a highly visual specialty, but diagnosis goes beyond just “looking.” It involves utilizing technology to see beneath the surface and pathology to understand the cellular makeup of a lesion. At Liv Hospital, we employ advanced diagnostic tools to ensure accuracy, whether checking a suspicious mole or diagnosing a complex rash.

The Dermatological Examination

The diagnostic process begins with a Total Body Skin Exam (TBSE). The dermatologist systematically checks the skin from head to toe, including the scalp, between the toes, and the nails.

  • Dermoscopy: The standard tool for evaluating pigmented lesions. A dermoscope is a handheld device that combines magnification with polarized light. It allows the doctor to see structures in the epidermis and dermis that are invisible to the naked eye, significantly increasing the accuracy of melanoma detection.
  • Wood’s Lamp Examination: A specific UV light is shone on the skin. It helps diagnose bacterial or fungal infections (which may glow) and pigmentary disorders, such as vitiligo.
  • Patch Testing: The gold standard for diagnosing Allergic Contact Dermatitis. Small patches containing common allergens (metals, fragrances, preservatives) are taped to the patient’s back for 48 hours to see which ones cause a reaction.

Skin Biopsy: The Definitive Diagnosis

When a diagnosis cannot be made by observation alone or when cancer is suspected, a biopsy is performed.

  • Shave Biopsy: Using a small blade to remove the top layers of a raised lesion.
  • Punch Biopsy: Using a circular tool (like a cookie cutter) to remove a small core of tissue, including the deeper dermis. This is essential for diagnosing inflammatory rashes or deep cancers.
  • Excisional Biopsy: Removing the entire lump or mole with a scalpel and stitching the wound closed. This is preferred for suspected melanomas to ensure the depth can be measured.
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Staging and Grading Skin Diseases

In dermatology, “staging” usually refers to cancer, while “grading” refers to the severity of inflammatory conditions.

  • Skin Cancer Staging (TNM System): Used for Melanoma and Squamous Cell Carcinoma.
    • Breslow Depth: For melanoma, the most critical factor is tumor thickness (measured in millimeters). A tumor less than 1mm thick has a much better prognosis than one deeper than 4mm.
    • Metastasis: Checking if the cancer has spread to lymph nodes or distant organs (using Sentinel Lymph Node Biopsy or PET/CT scans).
  • Acne Grading: Classified as Mild (comedones), Moderate (papules/pustules), or Severe (nodulocystic).
  • Psoriasis Scoring (PASI): The Psoriasis Area and Severity Index (PASI) measures the redness, thickness, and scaling of plaques, as well as the extent of body surface involvement. This score determines if a patient qualifies for biologic therapy.
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Treatment Details

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Dermatological treatment has evolved significantly. While creams and ointments remain important, modern dermatology also uses biologic injections, laser technology, and precision surgery. Treatment plans at Liv Hospital are customized to the patient’s goals, whether that is curing a cancer or rejuvenating an aging face.

Medical Management

  • Topical Therapies: The first line of defense.
    • Corticosteroids: Creams to reduce inflammation and itching (for eczema, psoriasis).
    • Retinoids: Vitamin A derivatives used for acne and anti-aging.
    • Immunomodulators: Creams that suppress the immune response locally.
  • Systemic Therapies: Oral or injectable medications for severe disease.
    • Biologics: Targeted antibody injections that block specific inflammatory pathways (like TNF or Interleukins) in psoriasis and eczema. These have revolutionized care for patients with severe disease.
    • Isotretinoin: A potent oral medication for severe, scarring acne.
    • Antifungals and Antibiotics: Used to treat infections.

Surgical Dermatology

  • Excision: Standard surgical removal of skin cancers, cysts, and lipomas.
  • Mohs Micrographic Surgery: A precise technique used for skin cancers on sensitive areas (face, nose, ears). The surgeon removes the cancer layer by layer and immediately examines it under a microscope. This ensures all cancer is removed while sparing as much healthy tissue as possible, resulting in smaller scars.
  • Cryotherapy: Using liquid nitrogen to freeze and destroy pre-cancerous spots (actinic keratosis) and viral warts.
  • Electrocautery and Curettage: Scraping and burning off superficial skin cancers.

Cosmetic and Aesthetic Procedures

Aesthetic dermatology focuses on restoring volume, reducing wrinkles, and improving skin texture.

  • Injectables:
    • Botulinum Toxin (Botox/Dysport): Relaxes muscles to smooth dynamic wrinkles (frown lines, crow’s feet).
    • Dermal Fillers (Hyaluronic Acid): Restore lost volume in cheeks, lips, and jawlines.
  • Laser and Light Therapies:
    • Fractional Laser (CO2/Erbium): Resurfaces the skin to treat acne scars and deep wrinkles.
    • IPL (Intense Pulsed Light): Treats redness (rosacea) and sunspots.
    • Laser Hair Removal: Permanently reduces unwanted hair.
  • Chemical Peels: Applying a chemical solution to exfoliate the top layers of skin, treating dullness and pigmentation.
  • PRP (Platelet-Rich Plasma): Using the patient’s own blood growth factors to stimulate collagen and hair growth.

The Medical Center

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Skin health is a lifelong journey. Whether you are fighting a stubborn infection, worried about a changing mole, or seeking to refresh your appearance, the setting matters. Liv Hospital’s Dermatology and Aesthetics Department bridges the gap between a sterile clinical environment and a luxury aesthetic center. We offer the safety of a hospital with the artistry of a high-end studio.

Why Choose Liv Hospital for Dermatology?

In an era where non-medical personnel often perform skin procedures, Liv Hospital stands for medical safety and expertise.

  • Board-Certified Dermatologists: All procedures, including cosmetic injections and lasers, are overseen or performed by medical doctors specializing in the skin. This minimizes the risk of complications like burns or infections.
  • Digital Dermoscopy and Mole Mapping: We utilize FotoFinder or similar digital mapping technology to photograph the entire body and track moles over time. This Artificial Intelligence-assisted system helps detect subtle changes that might indicate early melanoma.
  • Comprehensive Acne Center: We do not just treat the pimples; we treat the scars. Our integrated approach combines medical management (to stop the breakout) with laser and light therapies (to repair the skin).

Advanced Technology Infrastructure

Our clinic is equipped with the latest FDA-approved laser and energy devices.

  • Q-Switched and Pico Lasers: For the removal of tattoos and stubborn pigmentation.
  • Pulse Dye Laser (PDL): The gold standard for treating vascular birthmarks (port-wine stains) and rosacea.
  • Ultherapy / HIFU: Non-surgical ultrasound technology for skin lifting and tightening.

A Holistic Approach to Skin

We understand that the skin reflects internal health.

  • Multidisciplinary Care: Our dermatologists collaborate with rheumatologists for autoimmune conditions, oncologists for advanced melanoma, and endocrinologists for hormonal acne and hair loss.
  • Patient Education: We prioritize teaching patients about sun protection, skincare routines, and trigger avoidance. We believe that an educated patient is the best partner in achieving healthy, radiant skin.

At Liv Hospital, we combine the science of medicine with the art of aesthetics to help you feel comfortable and confident in your own skin.

 

30
Years of
Excellence

Trusted Worldwide

With patients from across the globe, we bring over three decades of medical expertise and hospitality to every individual who walks through our doors.  

Book a Free Certified Online Doctor Consultation

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FREQUENTLY ASKED QUESTIONS

What is dermatology, and what does a dermatologist do?

Dermatology is the medical field for skin, hair, and nail health. A dermatologist diagnoses and treats skin conditions, performs minor surgeries, and offers cosmetic treatments.

Dermatology treats acne, eczema, psoriasis, infections, skin cancer, hair loss, nail problems, and cosmetic concerns like wrinkles or scars.

Skin conditions include inflammatory (eczema), infectious (bacteria, viruses, fungi), neoplastic (moles, skin cancer), and pigment disorders (vitiligo, melasma).

See a dermatologist for new or changing moles, persistent acne, long-lasting rashes, sudden hair loss, or yearly skin cancer checks.

 Dermatology treats skin diseases and minor cosmetic issues. Plastic surgery focuses on reconstructive and major cosmetic surgeries on deeper tissues.

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