Basic Lesions
Mucula
Erythema
Pale pink to dark red
Disappear on vitro pression
the cause is Vasodilation
Purpura
Dark red
Do not disappear on vitro pression
Extravasation of blood
Pigmented macules
Melanin depositis into the epidermis or the dermis
Dark than the srrounding skin
Achromic macules
Decrease in the melanin content
Whitish than srrounding skin
Elevation with Solid Contents
Papules
Solid content
Epidermis or dermis
Size < 1cm
Elevations
Nodules
Deep dermis and subcutis
Hemispherical elevations
> 1 cm
Usually Related to Benign or Mailgnant Tumors
Vegetations
Filiform excrescences
Soft consistency
Warts
Excrescences
Increase in Upper layer of epidermis
Horny layer
Elevation with Fluid Contents
Vesicles
Cutaneous protuberances
Small (Size < 3mm)
Clear liquid
Most comon related to viral Infection as Herps Zoster
Bullae
Liquid content
clear, couldy or haemorrhagic
Size > 5 mm
Pustules
Liquid content
Purulent (pus)
Yelloish in color
Loss continuity of Skin
Erosions
Loss of substances
Superficial (epidermis)
No scars
Ulcers
Loss of substances
Deep Involve all layer of skin
There is a Scars
Common seen in Leg ulcer , Diabetic foot
Something add to the surface of skin
Scales
Aggregates of horny cells
Superficial layers of the epidermis (stratum corneum)
Detach in fragments (white)
Crusts
Concretions
When liquid lesions dry out(exudative, haemorrhagic or purulent)
Different colours
Change of skin normality
Atrophy
Reduction in skin thickness
Loss of elasticity
Sclerosis
Induration
Loss of suppleness
Gangrene
Tissue necrosis
Loss of arterial or arteriolar blood supply