I
Ichthyosis vulgaris
Etiology:
Cause: loss-of-function mutations in the gene encoding the protein filaggrin
Description: Dry scaly skin; most often it appears after about 2 months
Location: extensor side of extremities, scalp, central face, and trunk
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Immunoglobulin A vasculitis / Henoch-Schönlein Purpura
Etiology:
Cause: Small vessel vasculitis
Description: palpable purpura
Location: buttocks + legs
 Bullous HSP |  Classic Purpura |
|---|---|
 Classical purpura |  Ankle swelling (arthritis) |
 Henoch-Schönlein purpura |  Henoch-Schönlein purpura |
 Close-up of purpuric rash with vesicle (blister) formation |  Henoch-Schönlein purpura |
Impetigo
Etiology: S. aureus > S. pyogenes
Appearance: thin-walled vesiculopustules that quickly rupture; exudate with honey color and dried crust
At risk: 2-5 yo, contact sports, broken skin, humid weather
Location: face > extremities
Tx: bacitracin, mupirocin
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Incontinentia pigmenti
Etiology:
Cause: X-linked dominant disorder
Description: 4 stages of lesions: vesicular (red, blister-like lesions), verrucal (wart-like lesions), hyperpigmentation and hypopigmentation in a marble like pattern
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Infantile Acne
Etiology:
Intradermal Nevus
Etiology:
Cause: acquired nevus where melanocytes are found in the dermal layer of skin
Description: raised, dome shaped papules less than 10mm in diameter
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Intertrigo
Etiology:
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Appearance: satellite macules, papules or pustules around the erythema in the fold
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Sx: burns more than itches
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Location: inframammary fold, gluteal cleft, inguinal creases, folds under pannus
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Tx: clotrimazole cream
Irritant Contact Dermatitis (ICD)
Etiology:
Cause: physical and chemical irritants (wood, dust, soaps)
Description: burning and painful sensation with red patches
