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2. Allergic contact dermatitis - Wikipedia

   en.wikipedia.org/wiki/Allergic_contact_dermatitis

   Depending on the type of allergen causing it, the rash can ooze, drain or crust and it can become raw, scaled or thickened. Also, it is possible that the skin lesion does not take the form of a rash but it may include papules, blisters, vesicles or even a simple red area. The main difference between the rash caused by allergic contact ...

3. 7 signs your mystery rash is something more serious - AOL

   www.aol.com/news/7-signs-mystery-rash-something...

   These could indicate an infection or allergic reaction. 2. Bruise-like marks that spread suddenly. ... according to Mayo Clinic. 3. The rash does not become less severe with time. ...

4. Urushiol-induced contact dermatitis - Wikipedia

   en.wikipedia.org/wiki/Urushiol-induced_contact...

   The rash typically persists one to two weeks, but in some cases may last up to five weeks. Urushiol is primarily found in the spaces between cells beneath the outer skin of the plant, so the effects are less severe if the plant tissue remains undamaged on contact. Once the oil and resin are thoroughly washed from the skin, the rash is not ...

5. Contact dermatitis - Wikipedia

   en.wikipedia.org/wiki/Contact_dermatitis

   The rash appears immediately in irritant contact dermatitis; in allergic contact dermatitis, the rash sometimes does not appear until 24–72 hours after exposure to the allergen. Blisters or wheals: Blisters, wheals (welts), and urticaria (hives) often form in a pattern where skin was directly exposed to the allergen or irritant.

6. Anaphylaxis - Wikipedia

   en.wikipedia.org/wiki/Anaphylaxis

   Anaphylaxis is a severe allergic reaction of rapid onset affecting many body systems. [ 5 ] [ 8 ] It is due to the release of inflammatory mediators and cytokines from mast cells and basophils , typically due to an immunologic reaction but sometimes non-immunologic mechanism.

7. Dermatitis - Wikipedia

   en.wikipedia.org/wiki/Dermatitis

   In newborns, it causes a thick, yellow, crusty scalp rash called cradle cap, which seems related to lack of biotin and is often curable. (ICD-10 L21; L21.0) (ICD-10 L21; L21.0) There is a connection between seborrheic dermatitis and Malassezia fungus, and antifungals such as anti-dandruff shampoo can be helpful in treating it.