Skin, hair and nails Flashcards
KOH
- Fungal infections
- KOH, wait 20-30 min
- Presence of hyphae or spores
Gram stain
- Bacterial infection
- Gram +/-
- May determine abx
Wet mount
- BV or trichamonas
- BV = clue cells
- Trich = flagella
Woods light
- Black light to ID infxn
- Vitiligo, accentuated margins
Acetowhitening
- Warts
- Acetic acid turns warts white, better on mucosa
Shave biopsy
- Low suspicition of melanoma
- Using razor blade
Punch biopsy
Removal of core tissue, sample into deep dermis
Excisional biopsy
- Large, deep lesions
- Need to remove entire lesion- Melanoma
Incisional biopsy
- Small portion removed and sent to pathology
Liquid nitrogen- Indication
Seborrheic and actinitc keratosis, warts
- Lesions where surgery unnecessary/ favorable
Liquid nitrogen- Application
- Spray in circular pattern,
- Allow to unfreeze and repeat
Liquid nitrogen- AE
Pigment change, scarring, alopecia, nerve damage
Macule
Flat,
Patch
Flat, > 1 cm
Papule
Raised
Plaque
Elevated, circumscribed, > 1 cm, can be confluence of papules
Vesicle
collection of fluid
Bulla
> 0.5 cm collection of fluid
Wheal
Itchy, pink swelling,
transient
Nodule
Circumscribe, palpable lesion
- > 1 cm, demis and epidermis
Pustule
Circumscribed collection of leukocytes
- Can turn to be furuncle or carbuncle
Crust
Dried exudate
- Serous, purulent or hemorrhagic
Purpura
Non-blanching, extraversion of blood vessels
Fissure
Linear loss of epidermis and dermis
Petichiae
Pinpoint purpuric lesion
Keloid
Scarring that exceeds size of original injury
Scar
CT formation, dermal damage
Ulcer
Loss of thickness to dermis
Does not scar in mucus membranes
Atrophy
Thinning of skin, loss of subQ
Wrinkling and translucency
Erosion
Focal loss of epidermis,
- No scarring, does not penetrate dermis
Scale
Excess epidermal cells, abnormal keritization
Milia
Small, white yellow cysts, common in infatns
Blaschko’s lines
Non-random cutaneous distribution pattern of skin lesion or pigment abnormalities arising from embryogenesis and mosaicism
Seborrheic keratoses- Eti
- Fair skinned, elderly, prolonged sun exposure
- Benign
Seborrheic keratoses- Sx
- Stuck on appearance
- Small plaque, velvety tan, flesh clolored
Seborrheic keratoses- Tx
Cryo to remove
- No tx needed, cosmetic removal
Atypical nevi- Eti
- People with lots of moles
- Fried egg appearance in sun exposed areas
- Indistinct borders
Malignant melanoma- Eti
- UV radiation
- Fair skinned, light hair/ eyes
- Very aggressive, high rate of METS
- Most common skin cancer death
Malignant melanoma- Sx
Asymmetry Irregular borders - Blue to black color - > 6 mm - Change in appearance
Malignant melanoma- Dx/ Tx
- Full thickness excision
- Skin exams q 6 mo x 5 years, q 3 mo with multiple
Seborrheic dermatitis- Eti
- Unclear, high sebaceous glands
- Scalp, face, brows, body folds
- Adult men
- Lifelong recurrence and outbreaks
Seborrheic dermatitis- Sx
- Infants- cradle cap
- Erythematous greasy plaques with fine white scale
Seborrheic dermatitis- Tx
Selenium sulfide, ketoconazole
- topical steroids
Dermatofibroma- Sx
- Firm, hyper pigmented nodules
- Dimple when squeezed
- Benign
MRSA- Sx, Dx
- Erythema, induration, drainage and abscess, boils
- Wound culture
MRSA- Tx
- Clindamycin
- Doxy or minocycline
- TMP-sulfa
Erythrasma- Eti
- Chronic, superficial Corynebacterium minutissimum infxn
- Gram +
- Old, obese, DM
Erythrasma- Sx
- Intertriginous areas, web spaces, axilla
- Sharply marginated patch- tan to pink
- Maceration
Erythrasma- Dx
Woods lamp- Coral red florescence
Erythrasma- Tx
Benzoyl peroxide wash
- Clinda or erythromycin lotion
Scabies- Eti
- Sarcptes scabiei infestation
- Skin to skin contact, fomites
Scabies- Sx
- Intensley pruritic red papules with linear burrows
- Intertriginous zones, web spaces
Scabies- Dx
Skin scraping- mites or eggs
Scabies- Tx
- Permetharin (elimite)
- Lidane
- Wash bedding, towels