Contact Dermatitis
Contact Dermatitis — an inflammatory skin reaction that develops when the skin touches a substance that either irritates it or provokes an allergic response. It typically shows up as redness, itching, burning, or small blisters limited to the areas of contact.
Key points
- It has two main forms: irritant contact dermatitis from direct damage and allergic contact dermatitis from an immune-mediated reaction.
- Common culprits include fragrances, preservatives, nickel, certain plant oils, and harsh cleansing agents.
- The rash usually appears where the trigger touched the skin, which can help identify the offending substance.
- Avoiding the trigger and using gentle, barrier-supportive moisturizers is central to calming and preventing reactions.
Frequently asked
How is irritant contact dermatitis different from an allergic reaction?
Irritant dermatitis is direct damage from a substance and can affect anyone with enough exposure, while allergic dermatitis involves a specific immune response that develops only in sensitized individuals.
How can patch testing help?
Patch testing performed by a dermatologist applies small amounts of common allergens to the skin to identify which specific substances trigger an allergic response.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
