Basic Lesions of The Skin

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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