Skin Itching Caused By Demodex, Mites, Lice Parasites

Demodex is a arthropod, temporarily living in the hair follicles or close to hair follicles, sebaceous glands, especially in the forehead, cheeks, sides of nose, eyelashes, on skin scales in humans and animals. There are 2 common species of Demodex that parasitize on the surface of human skin:
Demodex was found on the patient's facial skin at PK Anh Te Nga
Long type: Demodex folliculorum (D folliculorum), they are usually found in hair follicles and hair.
Short type: Demodex brevis (D brevis), often found in sebaceous glands
When mature D.folliculorum has a length of 0.3-0.4 mm, D.brevis 0.15-0

2mm, has four pairs of short legs near the head and neck
(Demodex cannot be detected by naked eye, only seen under optical microscopes, they are about 100-300μ long).
Demodex usually live in pairs, life cycle over a period of 18-24 days on its host.


Skin Itching Caused By Demodex, Mites, Lice Parasites

. The female lays 20 to 24 eggs in the hair follicle.
The female demodex folliculorum will be shorter and rounder than the male. Both females and males have external genitalia. After intercourse on the surface of the skin, they will go deep into the skin and lay eggs in the hair follicles, sebaceous glands, accompanied by bacteria and excreted waste, then they die in the skin immediately after laying egg.
After death, Demodex's corpse liquefies and decomposes within the skin, causing allergic reactions in certain parts of the skin tissue, causing red spots (acne)
Local skin allergies, erythema, papules and pustules are reactions by the body's immune system
Clinical symptoms:
Demodex can live on normal healthy human skin without clinical manifestations, but will cause illness when they are concentrated in large numbers on the scales, hair follicles or when the body's immune system is impaired. Dermodermatitis caused by Demodex has 3 main forms:
Pityriasis folliculitis (the mildest form): a common lesion is a reddish mass of skin, on the surface of the skin appears, the horn button in the hair follicle, the patient will feel like there are ants crawling on his skin.
Demodex dermatitis manifests itself as a form of acne.
Granulomatous rosacea (this form is less common and is often seen in people with immunodeficiency syndrome).


Skin Itching Caused By Demodex, Mites, Lice Parasites

.
Most patients with Demodex infection will miss this cause, not diagnosed with Demodex dermatitis but often misdiagnosed with contact dermatitis, rosacea or perioral dermatitis. On the other hand, the most common lesion site is in the face area, which affects the patient's aesthetic quality.
How to prevent disease:
Wash your face regularly daily
Avoid contact with oily cleansers and oily makeup
Exfoliate regularly to get rid of dead skin cells.
Apply salicylic ointment or metronidazole gel Strictly follow treatment according to doctor's instructions.
Ganasoidae (Ganasoidae):
General characteristics: very small in size, mainly parasitic and pathogenic in poultry, rodents (birds, chickens, mice). Some types of abnormal parasites in humans with the common name is chicken mites.
Role of disease transmission:
Dermanyssus gallinae: is usually found in chickens (chicken mites) and can transmit to chicken and meningococcal disease in horses and humans.
Dermanyssus sanguineus: usually parasitic in rats and rodents can transmit to humans some type of chickenpox-like illness, commonly known as Rickettsial pox.
Dermatophagoides: also known as house dust mites, there are two species related to medicine that are D.


Skin Itching Caused By Demodex, Mites, Lice Parasites

.pteronyssus and D.farinae cause allergies and asthma
Some other species of mites cause dermatitis for humans.
Prevention:
Avoid curtains, furry toys, carpets, sheets, stuffed animals, etc.
Regularly wash your pajamas in the room and get a lot of sun exposure once a week.
The bedroom should be well-ventilated, with direct sunlight.
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