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Summary Derm-skin bacterial infections mind map

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This mind map provides a structured overview of bacterial skin infections in dermatology, organizing conditions based on depth and severity of infection. It covers superficial infections like impetigo, deeper infections such as cellulitis and erysipelas, and localized collections like abscesses and boils. The map highlights common causative organisms (e.g., Staphylococcus aureus and Streptococcus pyogenes), along with key risk factors and routes of infection. It also outlines clinical features, differential diagnosis, and investigations, with a focus on recognizing severity. Management is clearly summarized, including antibiotic therapy, drainage procedures, and supportive care.

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types name cusative agent predisposing factors age lesions investigation treatment

superfacial folliculitis (pustules)long chain pustules around the hair follicle -systemic antibiotics
(Bockhart's impetigo) 1-itchy skin diseases (scabies, eczema). a-painful, dom shaped -local metytosine
staph aureus any age. Treatment of predisposing factors (scabies, eczema ,anemia , diabetes
2-Topical steroid. b-sites (face ,limbs)
‫إلتهاب بصيالت الشعر‬ -‫صابونة معقمة‬ mellitus)
c-Healing (no scar)
Medical;
1-Topical;
1-septic focus a- K-permngnat-sol(anti septic + antiprurittic) ;1/8000 ‫(نسبة التخفيف‬for
Sycosis vulgaris staph aureus 2-indoor workers adults (pustules, papules) site upper lips, below jaws angles. Healing may minute scars. impetigo+ Ecthyma)
3-contaminated shaving instruments. ‫ في حالة زيدنا التركيز يجي للمريض‬pigmentation, burinng sensation &iriritation
b- ANTIBIOTICS. C- Rest ,Elevation of the part + Ice bag compress.(for
Follicular Nodule
cellulitis & erysipelas)

skin and skin appendage -low Immunity trauma -most common site;neck,buttock,Axillae، lower limb and face. • 2-Systemic ;Penicillin is the drug of choice. (erythromycin)i.v or i.m or
is collection of pus around the hair follicle in
Furuncle staph aureus -D.M Any Age -Healing scar. epidermis
systemic antibiotics ( pencillin drug of choice) oral. Analgesic like Aspirin when need (erysipelas ,furuncle…)
-Anemias -begin as small red nodulelater centrally suppurate with pus discharge some Surgical; incision when need ( furuncle……
become abscess


1) staphylococcus:
-inflammation of more than one folliculitis with multiple sinuses formation is collection of pus around a group of hair
normal flora of the nasopharynx, axilla, genital area,
-D.M discharge pus follicles deep ti the dermis
2)yeast :
Carbancle staph aureus -cardiac failure site :
normal Flora of the trunk, skin
-prolonged topical steroid site -back of neck and shoulder ,hips there is high grade of fever and , chills, pain.
-Healing; scar DDx : non folliclar pyogenic skin infection.

Pyogenic skin infection
two types:
1)bullous: primaary lesion is bullae ,eassy
-primary (Vesicles) on erythematous base rupture
Impetigo contagiosum staph , strep
1/Direct; pt. to pt infection
usually children both secondary (honey crust)
rupptured and cause crustsd and oozing. systemic antibiotics ( pencillin ) for 7 days and
(Classical impetigo) 2/indirect ;hot climate, malnutrition 2)non bullous: secondary lesion is honey crust olive oil to remove the crust
-Site ;Face ,limbs, scalp.
around the orifices
highly contagious

Follicular
Non Follicular
-Skin involvement (Subcutaneous tissue)
-indurated ,red ,tender, swelling with diffuse edge imparment of movement recurrency of cellulitis in lwwer legs is due to
Cellulitis Strept usually direct invasion through Wound ,ulcer . Any age
-systemic symptoms tenia pedis
• +++. Healing ;by scar.
bacteria
two types:
DM 1)streptococcus intertrigo:
CAUSES: DDx;
wetness -burning sensation & uncomfortable feeling. treat the underlying cause then give antibiotics ‫و‬
intertrigo 1)Infective ;streptococcal or Fungal
tight clothes -SIGNs; redness -maceration may be painfull fissure if secondery infected.
T .cruri s, Flexure Psoriasis ,S.D, scabies with
2)NON Infective; simple(friction) interdigtal intertrigo. ‫صابونة معقمة و و تجنب الثياب الضيقة‬
obesity
2)candida iterttrigo


-start as vesicular or vesico pustular increase gradually with formation of thick
-operating wound Vesicles or bullas in sever case.
crust . early: systemic antibiotics and nonsteroidal ‫عشان‬
-fissures near in auditory meatous ,Between -Relapsing case leads to permanent lymph
Ecthyma toes or under it. adults and children
-after rupture removal of the crust shows saucer ulcer with elevated edge
odema.
-scar formation with healing. ‫االلتهاب‬
(ulcer impetigo) -Abrasion scratches DDx: contact dermatitis, lupus erythmaatous ,
NON –Follicular -Accident wound ,Chronic ulcer
site in lower limb and face
- it's painfull with fever and chills
tuperculose leprosy
late : if fluctuation occurs it need surgery

only skin

(acute infection of subcutaneous tissue with involving the superficial dermal
lymphatic) -History ,Clinical picture.
COMPLICATION:
1)prodromal symptoms: -Exclude others by proper investigation
1- septecaemia
Erysipelas -by group A beta hemolytic streptococcus malaise high fever headach vomiting chill ,joint pain follow by Aspiration of bulla (culture shows the
2-Nephritis
2)skin manifestation:Local redness ,tenderness, hotness, swelling ,ch.ch border causative organism)
3-Abscess.
wall by like palpation. •DDx; CD. , LE ,TL , insect bite




-streptococcal
Angular Cheilitis -candida
-vit B deficiency;


Any age
-Erythromycin 250mg every 6h for /2weeks or
‫عبارة عن تصبغات تزيد مع الوقت‬ DDX:
-Obesity tetracyclin. -Topical ;imidazole,clotrimazol
(PATCH). Scaly-brownish well defined,dry non active irregular border. 1)Tinea cruris.
ERYTHRASMA Bacteria( Corynebacterium minutissimum) -systemic diseases e.g D.M ,hyperthyroidism
2)Pityyriasis verscollor.
twice dialy /2weeks.
,anaemias. -SITE; -erythromycin or clindamycin soluation .sodium
(flexurs area) axilla, under breast ,peri anal area. 3) Seborrheic dermatitis.
fusidate oint, mupirocin




by fatema okoff

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April 3, 2026
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