Bumps, lesions, scales, and blisters can all be classified as skin rashes. They are most commonly the result of allergies or infection, though there are many possible causes. If left untreated, rashes may cause scarring or serious infection. A rash for which an individual cannot pinpoint a cause should be examined by a doctor; though often mild, rashes can precede some serious conditions.
Rashes are often caused by an allergic reaction to a drug; some medications can also cause sensitivity to sunlight resulting in a rash. The reaction may become visible right away or not develop for hours or even days after beginning the course of medication. Generally, drug-related rashes appear as hives or eruptions that are purple, red, or discolored, and may develop anywhere on the body, including inside the mouth. The skin of the affected area may also thicken. In rare cases, a rash induced by drugs can be fatal; any adverse reaction to medication should be addressed by a doctor.
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