Being the largest organ of human body, skin covers about total area of about 20 square feet. Skin is considered as the first line of defense of our bodies, protecting us from millions if not billions of microorganisms and other harmful elements present out there in the environment, In addition with the protection from microbes skin is responsible for regulating body temperature and enables us to sense heat, cold and touch.
Three layers of Skin:
The outermost layer of skin is knows as epidermis. The function of epidermis is to create skin tone and provide a barrier which is waterproof. Epidermis contains a special type of cells called melanocytes. The function of melanocytes is to produce melanin pigments, these melanin pigment are responsible for creating tone or color of the skin.
The second layer beneath the epidermis is called dermis. Dermis is the layer which hosts or contain hair follicles, sweat glands and tough connective tissue.
The third, last and deeper layer is known as hypodermis.
Nearly any change in the skin’s appearance can be called a rash. Most rashes are from simple skin irritation; others result from medical conditions.
A general term for inflammation of the skin. Atopic dermatitis (a type of eczema) is the most common form.
Skin inflammation (dermatitis) causing an itchy rash. Most often, it’s due to an overactive immune system.
An autoimmune condition that can cause a variety of skin rashes. Silver, scaly plaques on the skin are the most common form.
A scaly condition of the scalp may be caused by seborrheic dermatitis, psoriasis, or eczema.
Acne: The most common skin condition, acne affects over 85% of people at some time in life.
Inflammation of the dermis and subcutaneous tissues, usually due to an infection. A red, warm, often painful skin rash generally results.
Skin abscess(boil or furuncle):
A localized skin infection creates a collection of pus under the skin. Some abscesses must be opened and drained by a doctor in order to be cured.
A chronic skin condition causing a red rash on the face. Rosacea may look like acne, and is poorly understood.
A virus infects the skin and causesthe skin to grow excessively, creating a wart. Warts may be treated at home with chemicals, duct tape, or freezing, or removed by a physician.
The most dangerous type of skin cancer, melanoma results from sun damage and other causes. A skin biopsy can identify melanoma.
Basal cell carcinoma: The most common type of skin cancer. Basal cell carcinoma is less dangerous than melanoma because it grows and spreads more slowly.
A benign, often itchy growth that appears like a “stuck-on” wart. Seborrheic keratosis may be removed by a physician, if bothersome.
A crusty or scaly bump that forms on sun-exposed skin. Actinic keratosis can sometimes progress to cancer.
Squamous cell carcinoma: A common form of skin cancer, squamous cell carcinoma may begin as an ulcer that won’t heal, or an abnormal growth. It usually develops in sun-exposed areas.
Herpes: The herpes viruses HSV-1 and HSV-2 can cause periodic blisters or skin irritation around the lips or the genitals.
Raised, red, itchy patches on the skin that arise suddenly. Hives usually result from an allergic reaction.
A benign fungal skin infection creates pale areas of low pigmentation on the skin.
Many viral infections can cause a red rash affecting large areas of the skin. This is especially common in children.
Caused by the chickenpox virus, shingles is a painful rashon one side of the body. A new adult vaccine can prevent shingles in most people.
Tiny mites that burrow into the skin cause scabies. An intensely itchy rash in the webs of fingers, wrists, elbows, and buttocks is typical of scabies.
A fungal skin infection (also called tinea). The characteristic rings it creates are not due to worms.
A piece of skin is removed and examined under a microscope to identify a skin condition.
Skin testing(allergy testing):
Extracts of common substances (such as pollen) are applied to the skin, and any allergic reactions are observed.
Tuberculosis skin test(purified protein derivative or PPD):
Proteins from the tuberculosis (TB) bacteria are injected under the skin. In someone who’s had TB, the skin becomes firm.
Medicines that reduce immune system activity may improve dermatitis. Topical steroids are most often used.
Medicines that can kill the bacteria causing cellulitis and other skin infections.
Medicines can suppress the activity of the herpes virus, reducing symptoms.
Topical creams can cure most fungal skin infections. Occasionally, oral medicines may be needed.
Oral or topical medicines can block histamine, a substance that causes itching.
Most skin cancers must be removed by surgery.
Various drugs can modify the activity of the immune system, improving psoriasis or other forms of dermatitis.
Dry skin is more likely to become irritated and itchy. Moisturizers can reduce symptoms of many skin conditions.