Flashcards in 3 - Derm - Benign and Malignant Melanocytic Lesions - Moles (naevi) Deck (13):
differences between acquired and congenital naevi
acquired - usually appear before 25 - progress through stages 1-3 over time
congenital - at birth, 1% of newborns
Acquired naevi - what causes them? when do they appear?
abnormal but benign proliferation of melanocytes in epidermis
appear in adolescence and early adulthood
3 main types of acquired naevi?
3 other types of acquired naevi?
junctional - appearance? where is proliferation?
macular and dark
at dermoepidermal junction - within epidermis
Compound - appearance? where are melanocytes?
brown papules (warty)
melanocytes in epidermis and dermis
Dermal - confused with? appearance? where?
only in dermis
loss of pigment, light brown to skin coloured
possible to confuse with BCC
atypical naevi - similar to? aetiology? risk of?
genetic, UV exposure
higher risk of melanoma esp if >50y/FHx
Halo naevi - where? who? appearance + why?
back of young adults
white halo due to lymphocyte mediated loss of melanocytes
they are benign
blue naevus - appearance and why
blue - melanocytes residing deeper in epidermis
2 types of congenital naevi
giant congenital naevi
cafe au lait macule
giant congenital naevus - appearance? risk?
"bathing costume naevus"
increased risk of melanoma