Derm- benign skin lesions Flashcards
features of benign pigmented lesions
well defined margin
even pigmentation
symmetrical
not changing over time to changing very slowly
what are freckles (ephelis)
Patchy increase in melanin pigmentation which occurs after UV exposure
people with freckles have one copy of which gene
MC1R gene
what are Actinic lentigenes also known as
age or liver spots
what are melanocytic naevi also known as
common moles
where are naevus cells in congenital melanocytic naevi
naevus cells cluster in the dermoepidermal junction
where are naevus cells in usual type acquired naevi
naevus cells at epidermal junction and upper dermis
what colour are Intradermal naevi
usually flesh coloured
what is a halo naevi characterised by
peripheral halo of depigmentation
what is seborrhoeic keratosis
benign epidermal tumour
what is seborrhoeic keratosis aka
basal cell papillomas
where are seborrhoeic keratosis commonly located
face and trunk
what do seborrhoeic keratosis look like
very well demarcated
raised
usually brown coloured
warty appearance
greasy hyperkeratotic surface
what malignancies are seborrhoeic keratosis associated with
gastric or colorectal adenocarcinoma
what is a dermatofibroma
a benign nodule caused by proliferation of fibroblasts, commonly triggered by trauma
what is dermatofibroma commonly triggered by
trauma
when are multiple dermatofibromas sometimes found
in immune conditions such as HIV and SLE
what sign appears in dermatofibromas when the lesion is squeezed or pinched
dimple sign
what is a pyogenic granuloma
a reactive overgrowth of capillary blood vessels
which factors are associated with pyogenic granuloma
Minor trauma, such as a pin prick
Infection, commonlyStaph. aureus
pregnancy
some medications, such as oral retinoids
how are pyogenic granuloma often described
raspberry like
what benign lesion has a “stuck-on” appearance
basal cell papilloma
