Skin Diseases  
The skin is the largest organ of the body, with a total area of about 20 square feet. The skin protects us from microbes and the elements, helps regulate body temperature, and permits the sensations of touch, heat, and cold. Skin has three layers: The epidermis, the outermost layer of skin, provides a waterproof barrier and creates our skin tone. The dermis, beneath the epidermis, contains tough connective tissue, hair follicles, and sweat glands. The deeper subcutaneous tissue (hypodermis) is made of fat and connective tissue. The skinís color is created by special cells called melanocytes, which produce the pigment melanin. Melanocytes are located in the epidermis.

Psoriasis is a common skin condition that causes skin redness and irritation. Most people with psoriasis have thick, red skin with flaky, silver-white patches called scales.Psoriasis is very common. Anyone can get it, but it most commonly begins between ages 15 and 35.It is not contagious.You cannot spread it to others.Psoriasis seems to be passed down through families. Usually, skin cells grow deep in the skin and rise to the surface about once a month. In persons with psoriasis, this process is too fast. Dead skin cells build up on the skin's surface.The following may trigger an attack of psoriasis or make the condition more difficult to treat:Bacteria or viral infections, including strep throat and upper respiratory infections, Dry air or dry skin, Injury to the skin, including cuts, burns, and insect bites, Some medicines, including antimalaria drugs, beta-blockers, and lithium, Stress,Too little sunlight,Too much sunlight (sunburn), Too much alcohol .

Acne (acne vulgaris, common acne) is a disease of the hair follicles of the face, chest, and back that affects almost all males and females during puberty; the only exception being teenage members of a few primitive isolated tribes living in Neolithic societies. It is not caused by bacteria, although bacteria play a role in its development. It is not unusual for some women to develop acne in their mid- to late-20s.Acne appears on the skin as congested pores ("comedones"), also known as blackheads or whiteheads, tender red bumps also known as pimples or zits, pustules, and occasionally as cysts (deep pimples, boils).

Dry skin / xeroderma-
Dry skin is a very common skin problem and is often worse during the winter when environmental humidity is low (i.e., "winter itch"). It can occur at all ages and in people with or without other skin problems. Dry skin very commonly produces itching, which can be severe and interfere with sleep and other daily activities. Repeated rubbing and scratching can produce areas of thickened, rough skin (lichenification). Dry, thickened skin can crack, especially in areas subject to chronic trauma (e.g., hands and feet), causing painful cracks in the skin (fissures). Dry skin and scratching may result in dermatitis when the skin becomes red (inflamed) in addition to dry and scaly. Round, scaly, itchy, red patches scattered over the legs, arms and trunk (nummular eczema) may also appear. The appearance of yellow crusts or pus in these areas indicates that a bacterial infection is developing.

is term for a group of medical conditions that cause the skin to become inflamed or irritated. The most common type of eczema is known as atopic dermatitis, or atopic eczema. Atopic refers to a group of diseases with an often inherited tendency to develop other allergic conditions, such as asthma and fever. There are different types of dermatitis like photo dermatitis caused by sun/radiation, allergic contact dermatitis due to allergens etc.

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