Yes: Angular cheilitis is caused by SALIVA drawn into a deep fold of skin. Mostly during sleep. Typically an older person who has lost teeth. If you are "dehydrated", WHY? If you are allergic to bactrim, (sulfamethoxazole and trimethoprim) why are you currently taking it? Why doxycycline? Try using vaseline or Aquaphor at corners of mouth. Apply several times at day but especially at night.
Answered 11/12/2015
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