Eczema and psoriasis are among the most frequently confused skin conditions. Both cause red, flaky, itchy patches. Both can appear on the elbows, knees, and scalp. But they have different triggers, different underlying mechanisms, and different management strategies. DermaRash helps you understand what you might be looking at — while being clear about what requires a professional diagnosis.
The Visual Differences
While a definitive distinction requires a dermatologist (and sometimes a biopsy), there are visual patterns that help differentiate the two:
- Psoriasis patches tend to be well-defined, with a silvery-white scale on top of a red, raised plaque. The edges are typically sharp and the scale is thick.
- Eczema patches tend to have less defined borders, appear more raw or weeping in acute phases, and the skin may show signs of scratching. The texture is different — more inflamed than scaled.
- Location patterns differ: Psoriasis often appears on extensor surfaces (outside of elbows, front of knees). Eczema more commonly affects flexor surfaces (inside of elbows, behind knees).
DermaRash's AI has been trained on a dataset of medically annotated skin images and cross-references its visual observations with peer-reviewed dermatology literature. Every insight includes a source citation so you can verify the information independently.
What DermaRash Can Tell You
The app provides educational information about what a skin appearance is consistent with — based on visual patterns in its training data. It can highlight features that dermatologists look for, suggest which category a presentation might fall into, and link to relevant clinical resources.
What DermaRash Cannot Do
DermaRash is explicitly not a diagnostic tool. It cannot:
- Replace a clinical examination — dermatologists use dermoscopy, touch, and patient history
- Distinguish conditions that look identical visually but differ by cause (e.g., fungal infection vs. psoriasis)
- Account for systemic signs (psoriasis is associated with psoriatic arthritis; eczema with allergies and asthma)
When to See a Dermatologist
Use DermaRash as a first step to become better informed. See a dermatologist if: the patch is spreading rapidly, it's on your face or genitals, it isn't responding to over-the-counter treatments after two weeks, you have joint pain alongside the skin symptoms, or the appearance is changing significantly. The app includes a "When to seek care" section with each analysis.
Educational AI insights — always with source citations.
Download on App StoreMobilApps.tech · iOS Developer: Evren Haznedaroglu