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The rash also typically spreads quickly, the Mayo Clinic says. Stevens-Johnson syndrome is considered a medical emergency and requires prompt treatment, Hu says.
Perioral dermatitis, also known as periorificial dermatitis, is a common type of inflammatory skin rash. [2] Symptoms include multiple small (1–2 mm) bumps and blisters sometimes with background redness and scale, localized to the skin around the mouth and nostrils.
However, this redness does not appear on darker skin and dermatitis can appear darker brown or purple in color. [19] Typical affected skin areas include the folds of the arms, the back of the knees, wrists, face and hands. Perioral dermatitis refers to a red bumpy rash around the mouth. [20]
Hives, also known as urticaria, is a kind of skin rash with red and/or flesh-colored, raised, itchy bumps. [1] Hives may burn or sting. [2] The patches of rash may appear on different body parts, [2] with variable duration from minutes to days, and do not leave any long-lasting skin change. [2]
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.
In a normal case, the swelling will decrease without treatment within 15–30 minutes, but, in extreme cases, itchy red welts may last anywhere from a few hours to days. In some cases, welts are accompanied with a painful burning sensation. [3] This calls for more urgent treatment as the condition can impact on the patient's quality of life.
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