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