Midterm- Skin/Hair/Nails Flashcards
epidermis
outer layer. thin. tough.
DEPENDS on the DERMIS for nourishment
stratified into zones
major ingredient= KERATIN
MELANOCYTES- gives our skin the color
the epidermis is made from dead keratinized cells
we shed ONE POUND of skin/year
the entire epidermis is replaced every 4 weeks
dermis
vascular, inner supportive layer
consists mostly of CONNECTIVE TISSUE AND COLLAGEN
dermis is tough, fibrous protein that allows the skin to RESIST TEARING
dermis is resilient!! elastic tissue that allows stretching with movement
the dermis is home to nerves, blood vessels, sensory receptors, and lymphatics
includes hair follicles, sebaceous glands, and sweat glands that are embedded into the dermis
subcutaneous layer
this is ADIPOSE tissue!
subq layer anchors the dermis to the muscle and bones
consists of lobules and fat cells. stores fat for energy!!
provides insulation (temperature control), cushioning
hair follicles
embedded in dermis layer
the growth is cyclic, and each follicle functions independently
hormones can influence growth of hair (pregnancy- shiny and soft, postpartum- hair loss, thinning…)
2 types of hair
VELLUS hair: short, fine, light, covers most of the body. think arms and abdomen…
TERMINAL hair: course, thicker, and pigmented. on head, eyebrows, pubic area, axillae (face and chest on males)
nails
GREAT indication of overall health!! (especially nutrition)
if nails are growing= getting enough protein!
hard plates of keratin, found on dorsal edge of fingers and toes
growth inhibited by illness or to the elderly
average growth=1 mm/week
takes 3 months to restore a fingernail (3x as long for toenails)
lateral nail fold- where ingrown nails occur
nail matrix and nail bed (where nail arises from)
sebaceous glands
lubricates the skin and hair
produces lipid substance sebum, secreted thru hair follicles
found everywhere BUT the palms and soles
most abundant in the scalp, forehead, face, and chin (why you have more acne in these places)
sweat glands
- ECCRINE
2. APOCRINE
eccrine sweat glands
coiled tubes that open directly onto the skin, produce a dilute saline solution: SWEAT
aid in temperature control (via evaporation)
children and the elderly can easily become overheated
apocrine sweat glands
produce thick, milky secretions, open directly into hair follicle
locations of apocrine sweat glands
axilla, anogenital, nipples, and the navel
become active with puberty
when bacterial flora reacts with apocrine sweat, you have BODY ODOR!
variations in skin color
pallor (fear, anxiety, anemia, shock)
erythema (high emotion, CO poisoning, polycythemia)
cyanosis (decreased perfusion, hypoxemia, congenital heart disease)
jaundice (hepatitis, cirrhosis, sickle cell disease)
dysplastic melanocyte
atypical mole
congenital giant nevus
lot of different sizes/darkness/shapes of moles
they are concerning because they can become dysplastic
normal physiologic jaundice in infants
1/2 of all newborns, appears on 2/3rd day
peaks at day 5
**disappears within one week of birth
pathologic jaundice in infants
appears within first 24 hours
related to hemolytic disease of the newborn
**JAUNDICE THAT PERSISTS BEYOND 2-3 WEEKS SHOULD BE OF CONCERN
miliara rubra in infants
scattered vesicles on an erythematous base- sweat gland obstruction, disappears within one week
erythema toxicum in infants
looks like flea bites!
unknown etiology
disappears within one week after birth
pustular melanosis in infants
seen in AA infants
can last several months
small vesiculopustular over a brown macular base
milia in infants
pinhead, smooth, white raised areas without surrounding erythema
on nose, chin, forehead
retention of sebum in sebaceous gland
abnormal texture of skin
rough- hypothyroid
velvet- hyperthyroid
cherry angiomas
small, smooth, slightly raised red dots
commonly appear on trunk of adults
this is not significant
think red mole
ecchymosis
should be CONSISTENT with trauma
bruising above the knee or below the elbow is SUSPICIOUS
bruising
bruising cycle
0-5 days: red, blue, purple, and tender
5-10 days: greenish yellow
> 10 days: brown
2-4 weeks: healed
salmon patch in infants
nervus simplex
40% of all newborns have this
flat, irregular, light pink patches
nape of neck: stork bite
almost all disappear by age 1
darkish purple lesions on face/extremities in infants
port wine stains
does not fade
laser removal to help reduce
elevation of lesions
pedunculated
rises off a stalk, think skin tags
pattern and shape of lesions
annular- ring shape
grouped- all together with no outliers
confluent- throughout
linear- line
discrete- couple of small areas
gyrate- serpentine
iris
polycyclic- round
zosteriform- follows a dermatome (herpes zoster)
fitzpatricks sign
positive when dimpling and retraction of the skin lesion beneath the skin with lateral compression
seen with DERMATOFIBROMAS
ex: when you squeeze a pimple, it sinks down
nodules derived from mesodermal and dermal cells
FIRM, RAISED PAPULES, PLAQUES, OR NODULES that very in size (3-10 mm in diameter)
color- brown, purple, red, yellow, pink…
multiple (>15) on a person may be associated with an autoimmune disorder
usually asymptomatic
NEEDS TO BE INVESTIGATED! TO MAKE SURE ITS NOT MELANOMA
abnormal hair distribution can be related to what things?
aging, PCOS, thyroid (hypo/hyper)
abnormal inspection of nails:
spoon nails- anemia
dirty- poor self care, job
bitten- anxiety
clubbing- O2 insufficiency
paronychia- red, swollen nail folds, VERY tender
paronychia
red, swollen nail folds, VERY tender
acute- bacterial infection (manicure with not sterile tools)
chronic- fungal infection (think someone who works as a dishwasher)
onycholysis
separation of nail plate from nail bed
yellow nails
white nail syndrome (leukonychia)
koilonychia
yellow nails
can indicate lung disorders
white nail syndrome (leukonychia)
arsenic poisoning
chronic renal failure
heart disease
koilonychia
iron deficiency
spooning
thin
indications of pits, grooves, lines in nails
nutritional deficiency
brown linear nail streaks in light skinned people
melanoma
splinter hemorrhages of nails
occur with endocarditis
working with hands
beau’s lines in nails
visible line on nail due to nail stop growing
can happen during serious illness
think ICU patient
body trying to preserve its work- stops producing nail
can be traced to high fever, infection, ICU stay
macule
primary lesion
flat, circumscribed, nonpalpable
small (up to 1 cm)
color change
examples of a macule
freckles, measles, nevus, solar lentigos
solar lentigos (sunspots)- sun induced, well circumscribed
patch
primary skin lesion
this is a macule that is >1cm
example: mongolian spot
vitiligo
a type of patch (primary skin lesion)
absence of melanocytes
autoimmune
M=F
cafe au lait
with vitiligo, you are at increased risk of…
thyroid disease
DM
pernicious anemia
papule
a type of primary skin lesion
solid, elevated, circumscribed
> 1cm!!
example: elevated nevus (mole)
elevated nevus (mole)
a type of papule (primary skin lesion)
molluscum
wart (verruca)
molluscum
a type of elevated nevus (mole) (which is a papule)
solid skin-colored papules with central umbilication
self-limited vital infection
wart (verruca)
a type of elevated nevus (mole) (which is a papule)
anal
plantar
plaque
a type of primary lesion
papules that are >1cm
plateau like, disc shaped
confined to superficial dermis
may result from confluence of papules
lichen planus
a type of plaque
acute/chronic inflammatory dermatosis
salmon colored base
small amount of scale
nodule
solid, elevated, hard/soft
> 1cm
extends deeper into the dermis than a papule
examples of a nodule
xanthoma, fibroma, carcinoma
tumor
solid, elevated, hard/soft
> 2cm!
examples of a tumor
lipoma (fatty tumor)
hemangioma
wheal
superficial, raised, transient
erythematous and irregular
examples of a wheal
insect bite
allergic reaction
urticaria
wheals coalesce to form extensive reaction- pruritic
vesicle
elevated cavity with free fluid
up to 1 cm
clear serum
examples of vesicles
herpes simplex
varicella
herpes zoster
bulla
elevated cavity with free fluid
> 1cm
thin walled
ruptures easily
examples of a bulla
friction blister
2nd degree burn
contact dermatitis
pustule
circumscribed, elevated
filled with pus
examples of a pustule
impetigo
folliculitis
acne
acne
a type of pustule
closed with comedomes= white head
open comedomes=black heads - oxygen turns it black
erosions
a type of secondary lesion
scooped out, shallow depression
superficial epidermis loss
moist, doesn’t bleed
heals without a scar