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derm part 3
med sci exam 1 material
| Question | Answer |
|---|---|
| most common benign epithelial tumor | seborrheic keratosis |
| seborrheic keratosis seen in | adults 50 yo or older |
| seborrheic keratosis presentation | cosmetic concerns, yellow-dark brown oval plaque |
| dermatofibroma | benign proliferation of fibroblasts |
| dermatofibroma presentation | mild pruritis, flesh-tone or hyper pigmented papule or nodule |
| lipoma | mature fat cells enclosed by a thin fibrous capsule that develop in subcutaneous tissues |
| lipoma presentation | soft, contender, flex tone mobile nodule |
| most common type of cutaneous cyst | epidermoid cyst |
| epidermoid cyst | discrete nodules resulting from the implantation and proliferation of epidermal elements within the dermis |
| tinea corporis | ringworm |
| tinea pedis | athletes foot |
| tinea pedis can be | interdigital or hyperkeratosis |
| part of the normal flora found on skin and mucus membranes | candida |
| most common candida | Candida albicans |
| clinical syndromes of candida infections | oropharyngeal "thrush", esophagitis, vulvovaginitis/balanitis, intertrigo, nipple thrush |
| treatment for candida infectioins | topical or oral anti fungal s |
| pityriasis versicolor | yeast infection of the skin |
| pityriasis versicolor generally seen in | adolescents and young adults |
| pityriasis versicolor presentation n | mild pruritis, hyper/hypopigmented macules and patches |
| pityriasis versicolor treatment | topical antifungals |
| scabies | infestation of the skin by the mite sarcoptes scabiei |
| transmission of scabies | direct and prolonged skin to skin contact |
| presentation of scabies | pruritus , may see small erythematous papules and thin burrows on skin |
| diagnosis of scabies | clinical, microscopic exam- skin scraping |
| treatment of scabies | permethrin cream, environmental control |
| pediculosis | LICE- obligate, blood sucking parasites that can infest the human head, body, and pubic region |
| treatment of lice | permethrin shampoo/cream |
| pediculosis capitis is most common in | children |
| transmission of pediculosis capitis | direct contact and some fomites (NOT hygiene related) |
| pediculosis capitis presentation | PRURITUS |
| pediculosis corporis is generally seen in | people with poor hygeine |
| pediculosis corporis presentation | pruritis , may visualize mites on body or gathered along clothing seams |
| simple skin and soft tissue infections | cellulitis, impetigo, folliculitis, abscess |
| complicated skin and soft tissue infections | deep abscess, necrotizing fasciitis, gangrene, animal bite infections, diabetic foot infections |
| risk factors specific for cellulitis, erysipelas, and abscess formation | skin barrier disrupted bc of trauma, skin inflammation, edema , obesity, immunosuppression, existing skin infection |
| cellulitis | areas of skin erythema, edema, warmth; develop as a result of bacterial entry via breaches in the skin barrier |
| cellulitis occurs over areas of | skin breakdown |
| microbiology of cellulitis | beta-hemolytic streptococci |
| erysipelas | lesions are raised above the level of surrounding skin, clear line of demarcation between involved and uninvolved tissue |
| microbiology of erysipelas | beta-hemolytic streptococci |
| erysipelas usually occurs over the | face, ears, lower legs (more common in extremes of age) |
| abscess | painful, fluctuant erythematous nodule with or without surrounding cellulitis |
| abscess microbiology | staphylococcus aureus, streptococcus |
| abscess clinical features | collection of purulent material with surrounding granulation, painful swelling, central fluctuant, overlying skin necrosis |
| impetigo caused by | staphylococcus aureus, group A beta-hemolytic streptococcus pyogenes |
| impetigo generally occurs in | young children |
| impetigo presentation | vesicles that rupture, leaving erosion and honey colored crust, usually around mouth and nose |
| treatment of impetigo | topical antibiotics |
| examples of necrotizing soft tissue infections | necrotizing forms of fasciitis, myositis, and cellulitis |
| infection of the deep soft tissues that result in progressive destruction of the muscle fascia and overlying subcutaneous fat | necrotizing fasciitis |
| 2 types of necrotizing fasciitis | polymicrobial type 1, mono microbial type 2 |
| necrotizing soft tissue infections are characterized by | fulminant tissue destruction, systemic signs of toxicity, high mortality |
| infection of skeletal muscle typically caused by gas (RARE) | necrotizing myositis |
| risk factors for necrotizing soft tissue infections | major penetrating trauma, recent surgery, blunt trauma, immunosuppression, skin breach, malignancy, obesity, alcohol use disorder |
| distribution of necrotizing soft tissue infections | LE most common, perineum, head and neck region |
| class 1 soft tissue infection | simple infection, no systemic signs or symptoms, amenable to outpatient management with topical or oral antibiotics |
| class 2 soft tissue infection | systemic signs and symptoms indicating spread, stable comorbities, may require inpatient management |
| class 3 soft tissue infection | infection with systemic signs and symptoms spread , or uncontrolled cormobidities, impatient required |
| class 4 soft tissue infection | infection with signs of potentially fatal systemic sepsis , surgery may be indicated |
| most common skin disorder in the US | acne vulgaris |
| acne vulgaris | chronic inflammatory disease involving the pilosebaceous unit |
| 4 main factors leading to formation of acne lesions | increased sebum production, hyperkeratinization of hair follicle, colonization by propionibacterium acnes, inflammatory response |
| acne vulgaris predisposing factors | genetics, medications, mechanical occlusion and pressure, oil containing cosmetics |
| treatment for acne vulgaris | OTC products, topical and oral antibiotics, retinoids, accutane |
| rosacea | chronic facial skin condition of unknown cause , seen in adults , lesions have variable morphology |
| lesion description of rosacea | red papules and pustules, thickening of nasal skin (rhinophyma), flushing, telangiectasias |
| treatment of rosacea | topical metronidazole, oral antibiotics, laser therapy |
| herpes simplex transmission | oral secretions, contact with vesicular fluid |
| presentation of herpes simplex | cold sores |
| diagnosis of herpes simplex | tzank smear, PCR |
| treatment of herpes simplex | supportive, oral antivirals |
| chicken pox (varicella zoster) | primary infection with varicella zoster virus |
| presentation of varicella zoster | prodrome, pruritis, skin lesions |
| diagnosis of varicella zoster | tzank smear, PCR |
| treatment of varicella zoster | supportive unless immunocompromised |
| herpes zoster | reactivation of varicella zoster virus |
| presentation of herpes zoster | prodrome, PAIN, skin lesions- dermatomal distribution, severe atypical variants involving face/ear/eye |
| treatment of herpes zoster | supportive, pain control, oral antivirals |