Skin Flashcards
Macule
Flat circumscribed <5mm
Patch
Flat circumscribed >5mm
Papule
Elevated lesion <5mm
Plaque
Elevated lesion >5mm
Pustule
Discrete pus filled lesion
Vesicle
Fluid filled lesion <5mm
Bulla
Fluid filled lesion >5mm
Acute Utricaria
Hives
-edematous pruritic wheals
Acute Eczema
Pruritic inflammatory erythematous papules and scaly plaques
“The itch that rashes
Acute eczema over time the skin
Thickens due to acanthosis
Atopic autoimmune eczema
Autoimmune related
Genetic predisposition
Atopic triad of asthma, allergies, and eczema
Children then outgrow it
Allergic contact Eczema
Type IV hypersensitivity:
CD4+T lymphocyte mediated
Photoeczematous
Abnl reaction to UV
Irritan dermatitis
Contact exposure to irritant
Erythema Multiforme
Hypersensitivity reaction most often due to medication/drug and certain infections
Clinical features of erythema multiforme
Multiple types of lesions with macula papules vesicles with central pallor
Can lead to epidermal desquamation if progresses
Psoriasis is associated with
Heart disease and can lead to psoriatic arthritis
Psoriasis is a
Autoimmune T cell mediated rxn
Acanthosis
Epidermal thickening
Psoriasis histologically
Epidermal thickening with increase epidermal cell turnover but lack of maturity
Epidermal hyperplasia
Downward extension of Rete pegs
Parakeratoci scale
Clinically psoarias
Erythematous pink and salmon colored plaques
Koehler
Induce psoriasis lesion by local trauma
Auspitz sign
Punctuate bleeding when overlying scale is removed
Impetigo
Staph Aureus
Can be strep pyogenes
Contagious—usually kids
Impetigo states as ______ and then enlarges with honey colored crust
Small macule often perioral/perinasal
Blistering Dermatoses a blistering disease where
vesicles and bullae are primary skin findings
Blisters occur at different levels within epidermis
Acantholysis
Lysis of intercellular junctions between squamous cells
Subcorneal
Superficial epidermis at stratum granulosum: pemphigus foliaceus
Suprabasal
Above basal cell
Pemphigus vulgarisms
Nonacantholysis
Subepidermal
Below DEJ
Bulbous pemphigoid with intact intercellular junctions
Pemphigus is a type ____ hypersensitivity reaction
II
Pemphigus ______ bind to intercellular desmosomal proteins
IgG autoantibodies
DIF
Intercellular IgG deposition along keratinocytes cell membrane
DIF in pemphigus vulagris
IgG depositions throughout epidermis
Pemphigus Vulgaris
raise disease of elderly
Mucosal and skin involvement
-pressure points
Flaccid blister that easily rupee leading to denuded skin
Subepidermal nonacantholyis
Roof of blister is full thickness of epidermis
Actinic Keratosis/Cheilitis
Red scaly patches on chronically sun exposed skin
-fair skinned
Actinic Keratosis histo
Cytologic atypical with hyperplasia of basal cells with overall epidermal thinning
Freeze off or chemo topical
Benign skin neoplasms
Benign nervous
Precancerous/Atypical skin neoplasms
Actinic keratosis
Dysplastic nevi
skin Cancer neoplasms
Squamous cell
Basal cell carcinoma
Melanoma
Squamous cell carcinoma forms in
Keratinocytes of epidermis
Mutations in squamous cell carcinoma
UV light exposure
TP53 Mutation
HRAS and Notch receptor mutations
SCC other risk factors
HPV
Immunosuppressive from organ transplant
Arsenic infections
Xeroderma pigmentosum
SCC begins as _____ then over time
Red scaly plaques
Becomes invasive nodule and ulcerated
Most common type of skin cancer
Basal Cell carcinoma
Basal Cell carcinoma will appear
Red scaly patches and also pearly translucent papules with telangiectasisa
Usually on face
Basal Cell carcinoma
Arise in
Basal layer of epidermis
BCC genetic disorder
Basal cell nevus syndrome with PTCH gene mutation in hedgehog tumor suppressor pathway
Melanoma is____ most common
3rd
Melanoma signs
Rapid change in size of prior nevus with asymmetry
Color change
Itching/pain
New onset pigmented lesion esp in adults
Irregular borders
Melanoma color
Red brown black
Melanoma borders
Notched in appearance
Melanoma flat lesions radial growth
Flat lesions that enlarge
Melanoma Nodular lesions connote
Invasion into dermis
Vertical growth phase is
Key farce in nature of melanomas