29- Epidermal Nevi to SCC/Merkel Flashcards
Most common type of epidermal nevus
Keratinocytic epidermal nevi
Most common pattern of keratinocytic epidermal nevus
Linear epidermal nevus
Verrucous, skin colored, dirty gray or brown papules that coalesce to form serpiginous plaque
Onset at birth or within 10 years old
Follow lines of Blaschko
Keratinocytic epidermal nevus
Most common internal manifestations in keratinocytic epidermal nevus
Skeletal
CNS
Management of keratinocytic epidermal nevus
Can be difficult -recurs
5% 5-FU plus 0.1% tretinoin cream OD
Cryotherapy
CO2 or Er:YAG laser
Excision- small lesion
Closely arranged, grouped often linear papules that have dilated folliculr openings with keratinous plugs that resemble comedones
Unilateral, mostly on trunk, develop from birth to 15 years old
Nevus comedonicus
Treatment of nevus comedonicus
Uncomplicated- primarily cosmetic (pore strips, topical tretinoin)
Inflamed- oral isotretinoin 0.5mg/kg/day (most fail to respond)
Excision- limited area affected
Erythematous papules and plaques with fine scale; characteristically pruritic
Follow lines of Blaschko, onset before 5 yo
Usually occurs only on one side
Inflammatory linear verrucous epidermal nevus (ILVEN)
Treatment for ILVEN
Topical vitamin D
Topical anthralin
Steroids, retinoids- limited benefit
Surgical- excision, cryotherapy, laser
Circumscribed, red, moist, shiny nodule with some crusting and peripheral scale
Usually on shin, calf, thigh
Asymptomatic, slow growing, occurs after age 40
Clear cell acanthoma
Treatment for clear cell acanthoma
Cryotherapy, CO2 laser or excision
Sharply demarcated papules or plaques, βstuck on appearanceβ
Palms and soles spared, usually on chest and back
Crumbly surface, when removed, raw moist base revealed, common in sun exposed areas
Seborrheic keratosis
Treatment for seborrheic keratosis
Liquid nitrogen, curretage
Others: light fulguration and shave removal
Sudden appearance of numerous seborrheic keratoses in an adult thay may be a sign of cutaneous malignancy
Rapid onset, develops at the same time as the cancer, often pruritic
Sign of Leser-TrΓ©lat
Most common neoplasms associated with Leser-TrΓ©lat sign
Adenocarcinoma (GIT)
Other: lymphoma, breast, SCC of lung
Minute, round, skin colored or hyperpigmented macules or papules that develop on malar/cheeks below eyes, May also involve neck, upper chest
Asymptomatic
Usually begins in adolescence
Common in black/asians
Dermatosis papulosa nigra
Treatment for dermatosis papulosa nigra
Light curretage
Liquid nitrogen
Electrodessication
Risk factors for developing skin cancer
Fair skinned who tan poorly
Significant chronic or intermittent sun exposure
Other: history of skin cancer
Prior radiation, PUVA, systemic immunosuppression, arsenic exposure
Major cause of nongenital non melanoma skin cancer (NMSC) and actinic keratoses
Ultraviolet radiation (UVR)
In situ dysplasia from sun exposure
Found on sun exposed surface- multiple, red pigmented or skin colored, flat or elevated verrucous or keratotic
Surface covered with adherent scale, rough like sandpaper, usually 3 to 1cm
Actinic keratosis
Most common epithelial precancerous lesions
Actinic keratosis
Actinic keratosis can be prevented by
Sunscreen
Low fat diet
What are the six types of actinic keratosis
HABA PiLa
Hypertrophic Atrophic Bowenoid Acantholytic Pigmented Lichenoid
Treatment of actinic keratosis
Cryotherapy with liquid nitrogen
Topical chemotherapy- extensive, broad or numerous lesions
Surgical- chemical peel, laser, photodynamic therapy
Two agents most often used in topical chemotherapy of actinic keratosis
5-FU cream
- 0.5-5% OD
- 0.5% x 2-3 weeks
- 5% x 3-6 weeks
Imiquimod
-5% cream 3x a week
4 types of keratoacanthoma
Solitary
Multiple
Eruptive
Keratoacanthoma centrifugum marginatum