Lupus is distinguished by its malar "butterfly" rash that spares the nasolabial folds and the presence of systemic symptoms, unlike the more generalized pruritus of eczema.
This is distinguished by its distribution on exposed skin with sharp cutoffs at clothing lines and sparing of protected areas like under the chin.
This is identified by a distribution that perfectly matches the shape of an external allergen (e.g., a metal snap), a clue not seen in endogenous eczema.
This is a specific type of eczema characterized by a "crazy-paving" or cracked appearance on very dry skin, typically on the shins of older adults.
The key to this diagnosis is the history of a primary inflammatory focus (like a fungal infection) that precedes the widespread secondary eczematous rash.
This is a severe, persistent photosensitive eczema in older men, distinguished by its strict confinement to sun-exposed areas.
This is a broad category; its allergic form has sharp borders matching an allergen, while its irritant form is more related to pain/burning than the intense itch of atopic eczema.
The key feature is grouped, intensely itchy vesicles on the elbows and knees, a presentation distinct from the scaly plaques of eczema.
The pathognomonic violaceous rash on the eyelids (heliotrope) and papules on the knuckles (Gottron) are the key features that separate this from eczema.
This is a painful, exaggerated sunburn reaction, not a primarily pruritic, eczematous rash.
This is a complication of eczema, distinguished by the sudden eruption of monomorphic, "punched-out" erosions or vesicles on top of existing dermatitis, often with fever.
This T-cell lymphoma is suspected when total-body redness is recalcitrant to standard eczema therapy and may have "islands" of spared skin.
This is caused by direct chemical or physical damage and is often more painful than itchy, unlike the pruritus-defined nature of atopic eczema.
This is characterized by a shiny, glazed erythema on the weight-bearing surfaces of children's feet, sparing the arch, a specific pattern not seen in general eczema.
The violaceous, flat-topped, polygonal papules of lichen planus are morphologically distinct from the ill-defined, scaly patches of eczema.
This is a localized, thickened, leathery plaque that is the result of chronic scratching, not a primary inflammatory dermatitis itself.
A unilateral, non-healing eczematous plaque on the nipple is the classic presentation of this underlying breast cancer.
This autoimmune disease is characterized by superficial, fragile, crusted erosions that look like "cornflakes," a different primary lesion than in eczema.
This is an eczematous rash, but it is specifically triggered by a drug-sunlight interaction and confined to sun-exposed areas.
This is a transient, itchy eruption of papules that appears only after sun exposure and resolves, unlike the chronic nature of atopic eczema.
The diagnosis of this mite infestation is suggested by intense nocturnal itching, the presence of burrows (especially in finger webs), and involvement of other household members.
This is distinguished by its greasy, yellowish scale and predilection for oily areas like the scalp, eyebrows, and nasolabial folds.
This leukemic lymphoma is distinguished from severe eczema by the presence of significant lymphadenopathy and circulating malignant T-cells in the blood.
This form of eczema is localized to the lower legs and is defined by the presence of underlying edema and other signs of venous insufficiency.
This fungal infection is characterized by an annular plaque with a raised, scaly, advancing border and is confirmed by a positive KOH test.
