Benign Skin Tumours and Common Hair Disorders
Terms in this set (43)
4 benign tumours derived from superficial epithelium
- Seborrheic keratosis
- Dermatosis papulosa nigra
- Stucco seborrheic keratosis
- Skin tags
What does seborrheic keratosis look like?
scattered, brown, well defined, various sizes papules. Verrucous (feel like warts)
Risk factors for seborrheic keratosis (2)
- familial tendency
Seborrheic keratosis rarely can be an indicator of _____________
What does dermatosis papulosa nigra look like?
small, dark seborrheic keratosis in dark skin individuals
Dermatosis papulosa nigra occurs at ______ (younger/older) age than seborrheic keratosis
What is stucco seborrheic keratosis?
1-2cm scattered, slightly scaly papules usually on lower leg
Skin tags are also called
If you see skin tags in conjunction with acanthosis nigricans what should you suspect?
Common locations for skin tags (3)
- Under arms
- Around neck
3 Tumours derived from epidermal appendages
- Epidermal inclusion cyst
- Pilar cyst
- Sebaceous hyperplasia
What is an epidermal inclusion cyst?
compressible cystic nodule with a pore (cheesy material inside)
What is a pilar/trichelemmal cyst?
No pore, firmer, often familial. Arise from hair follicles
What is sebaceous hyperplasia?
erythematous, well defined umbilicated papules
Who gets sebaceous hyperplasia? (3)
- older (>30)
- Fair sin
- Oily skin
6 Tumours derived from Melanocytic tumours
- Junctional nevus
- Compound nevus
- Intradermal nevus
- Solar lentigo
- Epthelides (freckles)
- Blue nevus
What is a junctional nevus?
flat mole, seen in young people (childhood to age 40)
Pigment cells for junctional nevus are found in ________
What is a compound nevus?
palpable, slightly raised mole
Pigment cells for compound nevus are found in ________
dermal component and dermal-epidermal junction
What is a intradermal nevus?
very raised, may be skin coloured mole. seen in adults
Pigment cells for intradermal nevus are found in ________
What is solar lentigo?
Flat, light brown macules on sun exposed areas. Seen in older, fair skin, sun exposed.
What is a blue nevus?
mole that looks blue
Why does a blue nevus look blue?
Tindal effect- reflection/scattering of light as it passes through dermis
Pigment cells for blue nevus are found in _________
4 Tumours derived from mesodermal tissue
3 types of fibromas
What is a dermatofibroma
very common, usually on extremities. Very firm papule, skin colour/red.
What is an angiofibroma? What must you differentiate it from?
fibrous papule on nose, basal cell carcinoma
What is a hypertrophic scar?
thickening/elevation within location of scar
What is a keloid scar?
abnormal proliferation of scar tissue that grows beyond original margins of scar
What is a cherry angioma? Who gets them?
red papules or macule. Usually age >30
What is a hemangioma?
bigger than a cherry angioma. Often present at birth and shrink as you age
What is a lipoma?
subcutaneous collection of fat, usually not tender
What is androgenic alopecia?
male or female pattern hair loss (non scarring)
What is male pattern hair loss?
What is female pattern hair loss?
What is telogen effluvium?
thinning/shedding of hair due to early entry of hair into telogen (resting) phase. Usually 3-4 months after major illness/stress
What is alopecia areata?
autoimmune, patches of hair loss on scalp. Usually comes back spontaneously
What is alopecia universalis?
no hair on body at all
What is hirsutism?
excess hair growth in androgen dependent areas (face, chest, upper back, sideburns, etc.)
What is hypertrichosis?
excessive hair but not necessarily in androgen dependent areas