-provides a waterproof barrier and creates our skin tone

-it is formed mainly of dead skin cells 

-dermis pertains to the skin by giving it its flexibility and strength

-This layer also has the sweat and oil glands

-the hypodermis pertains to the skin by supporting and protecting layer 

-the hypodermis layer is also called “subcutaneous fat” 

-it pertains to the skin by Collagen gives your skin strength. Elastin, as its name implies, enables your skin to stretch and bounce back

-there are atleast 16 types of collagen

-they pertain to the skin by skin cell growth, repair, and metabolism. It optimizes the skin's immune system and helps destroy free radicals that can cause premature aging

-It’s estimated that 1 billion people are deficient in vitamin D

-keratin pertains to the skin by Keratin is the main protein in your skin, and makes up hair, nails, and the surface layer of the skin.

-keratin is extremely insoluble in water and organic solvents 

-vitamin A and the skin interact by Vitamin A thickening and stimulating the dermis 

-vitamin A decreased wrinkles 

-Sweat glands intersect with the skin because they are a type of exocrine gland, which are glands that produce and secrete substances onto an epithelial surface by way of a duct.

-women have more sweat glands then men 

-lesions on the skin are caused by injury . Primary skin lesions are abnormal skin conditions present at birth or acquired over a person’s lifetime.

- acne is the most common skin lesion 

-crust and the skin interact by a crust being a secondary skin lesion.

-The color of the crust can be a somewhat useful clue as to the depth of the skin lesion.

-macule and the skin interact by discolored area of skin less than 1 centimeter (cm) wide. It doesn't involve any change in the thickness or texture of the skin

-A macule greater than 1 cm. may be referred to as a patch.

-nodule and the skin interact by they develop from a lack of iodine, which is a mineral essential to the production of thyroid hormones

-thyroid nodules are three times more common in women 

-papules and the ski interact by acne, by pustules are the result of an increase in oil and bacteria trapped inside the pore by dead skin cells.

-Papules are often called skin lesions

-plaque and the skin is caused by T cells are overactive and accidentally fight off healthy skin cells.

-more then 3 million cases per year for plaques 

-scales happen on the skin when the outermost layer of the epidermis becomes dry and flaky and peels. The excess of dead skin cells results in the appearance of scaly skin

-This condition can also cause rough patches of skin

-The virus causes an excess amount of keratin, a hard protein, to develop in the top skin layer (epidermis).

-treatments include over-the-counter remedies, salicylic acid, freezing medicine, or surgery.

-a wheal affects the skin by A raised, itchy (pruritic) area of skin that is sometimes an overt sign of allergy.

-wheals are often caused “hives”

-Hirsutism is caused by an excess of male sex hormones called androgens

-alopecia and the skin interact by the body attacks its own hair follicles. A person's genetic makeup, combined with other factors, triggers this form of hair loss.

-there are more than 200,000 cases a year 

-Onychocryptosis and the skin interact by being caused by a yeast called Candida and not by the Trichophyton fungus named above.

-treatments are oral antifungal drugs, medicated nail polish or cream, or nail removal.

-onchophagia and the skin interact by people biting their nails and skin breaking those layers and damaging them 

-American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders (DSM) will classify nail biting as an obsessive compulsive disorder (OCD)

-the skin is affected by albinism by turning white and lacking melanin 

-The cause of albinism is cellular. Malfunctioning genes don't produce melanin and cannot be made to.

-contusions interact with the skin by being splotchy and discolored both soft tissue and bone contusions heal on their own within a week or two, though bone contusions might take longer.

-mild bruise or strain may heal within a few weeks. A more severe bruise or strain may take 6 weeks or longer.

-the skin is affected by bruises form when blood vessels near the surface of the skin are damaged, usually by impact from an injury. The force of the impact causes your blood vessels to burst open and leak blood.

-When you have thin skin, your blood vessels burst more easily, leading to more frequent bruising.

-Hematomas near the skin result in a large patch of skin discoloration (typically black and blue) that occurs after trauma to the soft tissue

-Bleeding accumulates in the epidural space, outside the "dura" which is the lining of the brain.

-the skin is affected by there being to many skin cell production causing new skin cells to develop too quickly. They are pushed to the skin's surface, where they pile up.

-More than 3 million US cases per year

-the skin has nothing really to do with rosacea because it is hereditary and is due to environmental factors as well 

-Treatments such as antibiotics or anti-acne medications can control and reduce symptoms. Left untreated, it tends to worsen over time.

-furuncles interact with the skin by a hair follicle going under the skin and getting stuck 

-there are more then 20,000 cases per year