Eli5: why do welts suddenly appear on your skin and go away immediately but rashes or other bumps take longer to go away?
In: Biology
Dermatology has many, many terms for skin conditions and they each have specific underlying causes. What matters most is what is causing the lesion (a general term for “abnormal thing”). A mild rash could just be an immune system hiccup that clears right away. Whereas a different sort of rash, like say a band of bubbly rashes on your chest could be from shingles which is caused by a virus and takes longer to heal.
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