Psoriasis – Definition

Psoriasis is a chronic, inflammatory skin disease. Knees, elbows, scalp, trunk, and nails are the most commonly affected areas. There are several types of psoriasis:

• Plaque — inflamed patches of skin topped with silvery, white scales (most common type)
• Guttate — small dot-like lesions
• Pustular — weeping lesions and intense scaling
• Inverse — in body folds (armpits, groin, under breasts)
• Erythrodermic — intense sloughing and inflammation of the skin

(Pressure Ulcers; Bed Sores; Decubitus Ulcers)

Pressure Sores – Definition

A pressure sore is a lesion that develops on the skin and underlying tissues due to unrelieved pressure usually over a bony prominence. The skin and tissues rely on an adequate blood supply for oxygen and nutrients. When tissues are compressed for an extended period from hours to days, blood supply can be cut off, leading to development of a sore.

(Allergic Contact Dermatitis; ACD; Contact Dermatitis; Allergic Dermatitis)

Poison Ivy, Poison Oak, Poison Sumac – Definition

Poison ivy, poison oak, and poison sumac are plants that cause a rash in those allergic to them. This rash is caused by a chemical in the sap. About 50%-70% of people are sensitized to this chemical and are, therefore, allergic. Virtually everyone will eventually become sensitized if repeatedly exposed.

Plantar Warts – Definition

Plantar warts are growths on the soles of the feet. They are often mistaken for corns or calluses. The warts are different because a virus causes them.

They grow in clusters and are usually flat. A plantar wart can often be distinguished by numerous black dots visible on their surfaces. Although plantar warts are generally harmless, their location beneath the feet can make them very tender. They also have a tendency to spread locally to other sites on the foot and elsewhere.

Pemphigus – Definition

Pemphigus is a group of rare autoimmune disorders. It causes large skin blisters. The immune system normally protects against germs and other foreign invaders. In this case, the immune system mistakenly attacks your own skin and mucus membranes. There are three forms of the disease:

• Pemphigus vulgaris — most common type of pemphigus; lesions may extend deep into the layers of the skin
• Pemphigus foliaceus — produces more superficial lesions
• Paraneoplastic pemphigus — most serious type; usually occurs in someone who has cancer

Pemphigus – Causes

The immune system produces antibodies. These cause the skin and mucus membranes to break out in blisters and burn-like sores. What causes the body to attack itself is not known. Sometimes a drug can cause symptoms.