Pale complexion? Sudden breakouts? Learn what causes common skin concerns -- and what to do (10 Photos)
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Painful canker sores can be triggered by vitamin or mineral deficiencies -- particularly a shortage of zinc, explains Dr. Day. If you've been suffering from frequent sores, see your doctor. He or she can administer a blood test to pinpoint the cause of the problem. Individuals diagnosed with a zinc deficiency are often advised to take a supplement or increase their consumption of zinc-rich foods such as red meat, beans and nuts.
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