Dermatology Flashcards
Eccrine Glands
A type of sweat gland
opens directly onto skin
regulates body temperature through sweat
Apocrine Glands
A type of sweat gland opens directly into hair follicles found in axillae and anogenital areas becomes active during puberty, decrease in aging adult produce body odor
ABCDE Rule
For nevi A - asymmetry B - borders (regular vs irregular) C - color (uniformity; tan, black, blue, red) D - diameter (>6mm) E - evolution or elevation
Secondary Skin Lesion
Later evolution or result of external trauma to the primary lesion
ex. Erosion Ulcer Fissure Excoriation Atrophy Scaling Crusting
Most common types of skin cancer arise from which skin layer?
Epidermis
Remember the layers by “Come Lets Get Sun Burnt”
What are the two main cell types in epidermis?
Keratinocyte - (epithelial cells) starts out in the basal cell membrane and differentiates all the way to the corneum (dead cell layer) —keratinocyte carcinoma
Melanocyte - pigment cells - located in between the dermis and epidermis –melanoma
What is the difference between BCC and SCC?
Both types of keratinoctye carcinomas
Basal Cell Carcinoma - cancer originating from the stratum basale (or the basal cell layer)
Squamous Cell Carcinoma - cancer originating from corneum, lucidum, granulosum, or spinosum
Which type of skin cancer is most common?
Keratinocyte carcinomas (SCC, BCC) making up ~97% of skin cancer
melanoma makes up about 2% of skin cancer but is much more deadly
Acanthosis
abnormal thickness of epidermis (relative to the location on the body)
diffuse epidermal hyperplasia
Invasive SCC
this means that the squamous cells have invaded based the basal membrane and into the dermis
Hyperkeratosis
thickening of stratum corneum by abnormal keratin
often associated with a qualitative abnormality of the keratin
Parakeratosis
Retention of nuclei in stratum corneum
normal in mucous membranes
Hypergranulosis
Hyperplasia of stratum granulosum, usually caused by intense rubbing
Papillomatosis
Hyperplasia and enlargement of contiguous dermal papillae leading to surface elevation
common wart
Dyskeratosis
Abnormal keratinization occurring prematurely in cells below stratum granulosum
Acantholysis
loss of intracellular connections causing loss of cohesion between keratinocytes
Spongiosis
epidermal intracellular edema
First Degree Burn
erythema, swelling
transitory, reversible
Second Degree Burn
Blisters involving epidermis
Hair follicles, adenxa in dermis spared
Third Degree Burn
Full-thickeness burns; massive necorsis of epidermis and parts of dermis, subcutis
cannot heal spontaneously
Macule
flat, smaller than 2cm (ex. freckle)
Patch
similar to macule but larger
flat >2cm
Papule
slightly elevated, smaller than 1 cm
ex. eczema caused by allergy
Nodule
similar to papule but greater than 1 cm
(slightly elevated)
ex. nevus