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Id Reaction. These Itchy Papules Occurred on the Extensor Aspects of the Arms and Legs in a Patient with Allergic Contact Dermatitis to Nickel.
Ill-Defined Hypopigmented Macules are Characteristic of Pityriasis Alba.
Infantile Hemangioma with Ledge Effect in a 3-Month-Old. Note the Abrupt Transition from Typical to Affected Skin (Ie, Steep Borders). Although the Distribution of This Lesion (Upper Back) Does Not Raise Concern for a Medical Complication, its Size and Steep Borders Might Justify Systemic Therapy, Given the Risk of Permanent Deformity.
Inflammatory Lesions are Erythematous Papules, Pustules, or Nodules. This Patient Has Moderate Acne. Note Some Mild Early Scarring.
In Ichthyosis Vulgaris, Fine Scales with a “pasted on” Appearance are Observed on the Distal Extremities.
In Infants, Psoriasis May Involve the Diaper Area, Appearing as Sharply Defined Erythematous Patches with Little Scale. Also Note Involvement of the Umbilicus, a Common Finding in Psoriasis.
In Kawasaki Disease, Non-Exudative Conjunctival Injection is Present, Often with Perilimbic Sparing.
In More Extensive Cases of Henoch-Schönlein Purpura, Lesions Can be Seen on the Upper Extremities as Well as More Classic Sites Like the Lower Extremities; Both Were Present in This Patient.
In Occluded Areas, Such as the Axilla, the Lesions of Psoriasis May Lack Scale.
In Patients with Darker Skin Tones, Erythema May be More Difficult to Appreciate in the Papules and Plaques of Pityriasis Rosea.
In Patients with Skin of Color, the Lesions of Kwashiorkor May Appear Hyperpigmented. However, the “flaky Paint” Appearance (Ie, Scale with a Well-Defined Raised e.g.) is Present.
In Persons with Darker Skin Tones, a Juvenile Xanthogranuloma May be Skin Colored or, as in This Patient, Red-Brown. Reproduced with Permission from Dermnet Nz.
In Peutz-Jeghers Syndrome, Lentigines Appear on the Face, Lips, and Oral Mucosa. They are Associated with Gastrointestinal Polyposis.
In Scarlet Fever, the Rash Often is Accentuated in Skinfolds.
In Severe Acne, Nodules and Scarring are Present.
In Some Patients with Skin of Color Who Have Atopic Dermatitis, Areas of Disease Activity May Appear as Slightly Larger, Flat-Topped (Lichenoid), Violaceous Papules.
In Staphylococcal Scalded Skin Syndrome, Erosions around the Mouth Often Take on a “sunburst” Appearance.
In Superficial White Onychomycosis, the Surface of the Nail Appears White and Has Fine Scale.
Intensely Pruritic Lesions of Dermatitis Herpetiformis on the Leg of a Patient with Celiac Disease.
Intertrigo, Shown Here Involving the Neck, Produces Superficial Erosions in Areas Where Moist Skin Surfaces are in Apposition.
Intertrigo is Characterized by Erythematous Superficial Erosions Located in the Skinfolds.
In the Diaper Area, Seborrheic Dermatitis Produces Salmon-Colored Patches with Greasy Scale that Involves the Creases and Convexities.
In the First Stage of Incontinentia Pigmenti, Vesicles and Crusting Appear in a Linear Arrangement on the Limbs or in a Whorled Distribution on the Trunk.
In This 4-Year-Old Who Had Morbid Obesity, Changes of Acanthosis Nigricans Were Present in a Diffuse Pattern, Including Classic Locations, as Well as Overlying the Knuckles and in the Wrist Folds, as Demonstrated Here.
In This Child with the En Coup De Sabre (Cut of a Saber) Form of Linear Morphea, Resolving Lesions Have Become Hyperpigmented.
In Tinea Versicolor, Potassium Hydroxide Preparation on Scale Obtained from a Lesion Demonstrates Short Hyphae (Red Arrows) and Spores (Yellow Arrows) (Ie, “spaghetti and Meatballs”).
In Tinea Versicolor, the Potassium Hydroxide Preparation Reveals Short Hyphae (Red Arrows) and Spores (Yellow Arrows) (Ie, “spaghetti and Meatballs”).
In Toilet Seat Dermatitis, Symmetric, Eczematous Lesions are Seen on the Posterior Thighs and Buttocks.
In Toxic Epidermal Necrolysis, Flaccid Bullae (Arrow) Appear and Rapidly Rupture.
Intradermal Nevus.