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Tuesday, June 10, 2008

skin lesions [continued]

today we discuss about secondary lesions:Secondary lesions may evolve from primary lesions, or may be caused by external forces such as scratching, trauma, infection, or the healing process. The distinction between a primary and secondary lesion is not always clear.

SCALE

Scales are heaped-up accumulations of horny epithelium[stratum corneum]

scales

Scaly signs in dermatology[superb article on scales]

24m




crust:

dried exudate.

impetigo

EXCORIATION

Excoriations are traumatized or abraded skin caused by scratching or rubbing.

excoriation

LICHENIFICATION

"Lichenification" refers to a thickening of the epidermis seen with exaggeration of normal skin lines. It is usually due to chronic rubbing or scratching of an area.

lichenification

fissure:

slit in skin which extends into dermis.

fissure

erosion:

partial loss of epidermis which heals without scarring.

erosion

ulcer:

at least the full thickness of epidermis is lost.healing with scarring.

ulcer

scar:

healing by replacement of fibrous tissue

scar

KELOIDS :excessive scar

Keloids are an exaggerated connective tissue response of injured skin that extend beyond the edges of the original wound.

keloid

note:excessive formation of components of repair process complicate wound healing-

hypertrophic scar:accumulation of excessive collagen may give rise to raised scar.{but not beyond boundaries of original wound}

keloid:if scar tissue grows beyond boundaries of original wound & does not regress.more common in african-americans.

exuberant granulation[proud flesh]:formation of excessive granulation tissue,which protrudes above level of skin & blocks re-epithelialization.

desmoids/aggressive fibromatoses:exuberant proliferation of fibroblasts & other connective tissue elements.interface b/w benign & malignant.

ATROPHY

Atrophy is thinning of skin due to shrinking of epidermis ,dermis or subcutaneous fat.

thats for today,next we will deal with special skin lesions


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