Dermatology Flashcards
The skin is derived from what primary embryological layer?
Ectoderm
What are the three primary layers of the skin?
Epidermis, Dermis, Subcutaneous tissue
Which layer of the skin is avascular and superficial?
Epidermis
What are the cells in the epidermis that are an important component of the immunologic barrier of the skin?
Langerhans cells
What type of cells found in the epidermis provide protection from UV rays?
Melanocytes
Which layer of the skin contains blood vessels, nerves, sweat glands, etc.?
Dermis
What is the purpose of the subcutaneous tissue of the skin?
Insulation against the cold
Reserve food source
What is the term for a flat area of discolored skin less than a centimeter in diameter?
Macule
What is the term for a solid elevation of skin less than one centimeter in diameter?
Papule
What is the term for a small, fluid filled elevation of the skin?
Vesicle
What is the term for a small pus filled elevation of the skin?
Pustule
What is a dermatologic term used to describe patches, marks, spots, plaques, and nevi?
Macules
What is a dermatologic term used to describe warts, skin tags, and moles?
Papules
What is a dermatologic term used to describe blisters of herpes simplex, chicken pox, or herpes zoster?
Vesicles
What is the term for a larger version of a vesicle?
Bulla (bullae = plural)
Nodules and tumors are considered larger versions of what kind of skin eruption?
Papule
What is the term for an edematous swelling from something like a mosquito bite or hives that are technically not solid?
Wheal
What is a dermatologic term used to describe pimples?
Pustules
Abscesses, furuncles, and carbuncles are larger versions of what kind of skin eruption?
Pustule
What is the term for the flaky skin seen in cases of dandruff, seborrhea, and psoriasis?
Scales
What is the term used for dried serum, blood, or purulent exudates seen in cases like weeping eczema and other skin conditions?
Crust
What is the term for the rough, thickened epidermis with accentuated skin markings seen in cases of chronic dermatitis?
Lichenification
What is the term for fine, irregular, superficial capillary dilations seen in cases like rosacea?
Telangiectasis
What is excoriation?
Linear, crusted loss of the epidermis or dermis (example = abrasion or scratch)
What is erosion of the skin?
Loss of some epidermis (example = sun damaged skin)
What is the term for a linear crack extending into the dermis (example = athlete’s foot)?
Fissure
What is an ulcer?
Skin concavity involving the epidermis and dermis (examples = bed sores)
What two common causes for a rash should be eliminated first before exploring other possibilities?
Contact and drug reactions
What are the most common allergens seen by practitioners leading to contact dermatitis?
Poison ivy and hand dermatitis from household or industrial irritants
If a patient presents with a more localized rash, what is most likely the cause?
Contact
If a patient presents with a more generalized rash, what is most likely the cause?
Drug reaction