KELOID and HYPERTROPHIC SCAR
Hypertrophic Scar (HTS) rise above the skin level but stay within the
confines of the original wound and often regress over time.
Keloids rise above the skin level as
well, but extend beyond the border of the original wound and rarely regress
spontaneously.
Both HTSs and keloids occur after
trauma to the skin, and may be tender, pruritic, and cause a burning sensation.
Keloids are 15 times more common in
darker-pigmented ethnicities, with individuals of African, Spanish, and Asian
ethnicities being especially susceptible. Men and women are equally affected.
Genetically, the predilection to keloid
formation appears to be autosomal dominant, with incomplete penetration and
variable expression
Keloids tend to occur 3 months to
years after the initial insult, and even minor injuries can result in large
lesions.
HTSs usually develop within 4 weeks
after trauma. The risk of HTSs increases if epithelialization takes longer than
21 days.
Keloids can result from surgery,
burns, skin inflammation, acne, chickenpox, zoster, folliculitis, lacerations,
abrasions, tattoos, vaccinations, injections, insect bites, ear piercing, or
may arise spontaneously, even minor injuries can result in large lesions. Certain
body sites have a higher incidence of keloid formation, including the skin of
the earlobe as well as the deltoid, presternal,
and upper back regions. They rarely occur on eyelids, genitalia, palms, soles,
or across joints. Keloids rarely involute spontaneously, whereas surgical
intervention can lead to recurrence, often with a worse result. Keloid scars
tend to occur above the clavicles, on the trunk, on the upper extremities, and
on the face.
HTSs They usually occur across areas
of tension and flexor surfaces, which tend to be at right angles to joints or
skin creases.. A hypertrophic scar can occur anywhere on the body.
Q) Keloid scars is made up
of –
a) Dense collagen
a) Dense collagen
b) Loose fibrous tissue
c Granulamatous tissue
c Granulamatous tissue
d) Loose areolar tissue
Ans: a. Dense collagen.
