what causes sores in the corners of the mouth
Angular cheilitis
Angular cheilitis can be caused by infection , irritation , or allergies . Infections include by fungi such as Candida albicans and bacteria such as Staph . aureus . Irritants include poorly fitting dentures , licking the lips or drooling , mouth breathing resulting in a dry mouth , sun exposure , overclosure of the mouth , smoking , and minor trauma . Allergies may include to substances like toothpaste , makeup , and food . Often a number of factors are involved . Other factors may include poor nutrition or poor immune function . Diagnosis may be helped by testing for infections and patch testing for allergies . 
Angular cheilitis can be caused by infection , irritation , or allergies . Infections include by fungi such as Candida albicans and bacteria such as Staph . aureus . Irritants include poorly fitting dentures , licking the lips or drooling , mouth breathing resulting in a dry mouth , sun exposure , overclosure of the mouth , smoking , and minor trauma . Allergies may include to substances like toothpaste , makeup , and food . Often a number of factors are involved . Other factors may include poor nutrition or poor immune function . Diagnosis may be helped by testing for infections and patch testing for allergies .
Angular cheilitis may be caused by infection , irritation , or allergies, such as  poorly fitting dentures , licking the lips or drooling , mouth breathing resulting in a dry mouth , sun exposure , overclosure of the mouth , smoking , and minor trauma .
Angular cheilitis can be caused by infection , irritation , or allergies . Irritants include poorly fitting dentures , licking the lips or drooling , mouth breathing resulting in a dry mouth , sun exposure , overclosure of the mouth , smoking , and minor trauma .
Infection , irritation , or allergies can affect the mouth and cause angular cheilitis. The infection can be caused by fungi and bacteria. Irritation can be caused by poorly fitting dentures , licking the lips or drooling , smoking , and minor trauma.  Allergies may be because of  toothpaste , makeup , and food. Other factors may include poor nutrition or poor immune function .
Angular cheilitis can be caused by infection , irritation , or allergies . Infections include by fungi such as Candida albicans and bacteria such as Staph . Irritants include poorly fitting dentures , licking the lips or drooling , mouth breathing resulting in a dry mouth , sun exposure , overclosure of the mouth , smoking , and minor trauma . Allergies may include to substances like toothpaste , makeup , and food . Other factors may include poor nutrition or poor immune function .