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Summary Derm- Parasite mind map (Scabies vs Pediculosis)

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This mind map presents a high-yield comparison between scabies and pediculosis in a clear, side-by-side table format—ideal for quick revision and exam recall. It covers key differences in causative organisms, mode of transmission, typical sites of infestation, and characteristic clinical features. The table highlights hallmark findings such as intense nocturnal itching and burrows in scabies versus visible lice and nits in pediculosis. Management is simplified by comparing first-line treatments, hygiene measures, and prevention strategies—helping you confidently distinguish between the two in clinical scenarios and OSCEs.

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disease types cusative agent transmission clinical picture diagnosis complications investigation treatment treatment

*support: ‫الزم نعمل دعم نفسي و نطمئن المريض انه مريض بسيط و ممكن يصيب الكل‬
*Prevention:
1)the patients and his family need to be tratted .
2)clean clothes and personal things in boiling water and expose it to sun light or iron
#primary lesion: burrow *Systemic : *Topical: ‫من الرقبه ألخمص القدمين‬
*Varieties;
1/sever itching At night 1)sedative Antihistamines for itching: *Permethrin 5%for adults
1/Noduler scabies. *caused by Femal mites (sarcoptes scabiei var 2/lesions= vesicles and papules 1/Acarophobia - skine scraping for scbiees : cetrzine or chlorphenamine 2.5% for infants under 2y
2/infantile scabie # highly contagious disease 1)parts of the parasites 2)Antibiotics for 2ry infection: ( most common staphylococcus aureus)
hominis ) 3/sites . 2/Irritation of skin by antiscabietic topical prepration . (BD for 3consecutive days every week for one month)
-close personal contact *Clinical & para clinical
scabies 3/Norwegian or crusted scabies *life cycle: 4w-6w
*incubation period: one month
-indirect by clothing or bedding
# family History +ve.
#site : all the body except between the
3/Post scabietic dermatitis .
4/Post scabietic nodules .
2)feaces
3)eggs
- penicillin
- amoxicillin with clavulonic acid
*Sulphur ointment 5-10 %
*Crotamiton 10% cream or lotion ‫مضاد حقه‬
4/animal scabies (zoonosis) *eggs:2-4 days
-sexual contact
5/secondary bacteria infection.1 # ‫ اذا لقينا االعراض نعطي دواء‬،‫غالبًا مانعملش فحص‬# 3)Ivermectin (antiparasitic)
scapula bed, mainly the roots of fingers and *gamma benzene hexachloride 1% lotion .
5/scabies incognito toes+ inner side of the thigh , around the -250-400/kg single dose
-once a week *Benzyl benzoate 10% and 25% lotion
6/scabies in clean umpilical in male #never in face *Ivermectin1% lotion
- repeat if :
norwegian scabies
sever itching
no response to treatment
recurrency


parasites *clinical diagnosis
treatment of pediculosis :
1)sever itching ,all day all night impetigo of the scalp especially -scalp impitigo
2)scratching which causes scalp injury and in the nape is usually due to -hypersenstivity area 1)physical : using special comb to remove pediculosis 3-4 times in day
caused by prdiculus humanus capitis(capitis) -direct: close contact secondary infection pediculosis -conjunctivitis 2)shampoo: perimethri(drug of choice) or hexogama benzil shampoo
pediculosis capitis ped capitis -indirect:using tools of the patients 3)conjuunctivitis duetoo sever infection -recurrent infection --> anemia * leave it on the hair for 5-10 minutes then wash it.
4) pediculid: a hypersensitivity rach that DDX: -secondary infection+ enlarged occipital lymph nodes 3) systemic antibiotic for secondary infection : pencillin
mimics viral exanthema . -dandraff -bad smell #we need to rebate the treatment after one week
-contact dermatitis # if secondary infectiondue to pediculosis you treat the infection then the pediculosis


-body lice are major vectors of :
-typhus( not typhoid).
PEDICULOSIS -the bits of parasites cause red macule& DDX: - trench fever
-by clothing or bedding. - relapsing fever & bacillary.
caused by pediculus-humanus corporis(body hemorrhagic spots. -contact dermatitis
pediculosis corporis louse)ped corporis
-the eggs of body louse are mainly on the clothing
- scratching cupan cause secondary infection -atopic dermatitis - angiomatosis or endocarditis
in contact with skin - vagsbonds disease: huge infection of pediculosis corporis cause sever itching
& pigmentation. -scabies
and it's not responding to anti-scabies
‫تنقل هذي االمراض عبر جرح البشره بسبب الحكه و دخول البيض و الفضالت إلى داخل الجلد‬



-direct: sexual
caused by phthirus pubic (crab louse)phthirus -indirect: usage of toilet and clothing tiny spots of blood or spots of bleeding with
pediculosis pubis # rare pubis -we can find it in mainly in pubic area ,but also in sever itching
DDX: secondary infection ?
eyeslahes , eyebrows axillary & beard.



by fatema okoff

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April 4, 2026
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