I have a rash in the corner of my mouth?

I have a rash in the corner of my mouth. have had it for about a week now. It is slightly itchy. is it a cold sore or something more serious?
Thank you,

Age: 25
Female
Medications: None

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9:31 am

Looks like angular cheilitis. probably die to a fungal infection caused by saliva build up on your lip. Your doctor will prescribe an anti fungal cream. Better to have a culture swab done to rule out any other condition.