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Thanks for contacting HCM with your health concern
1. belly button infection is common among people with pierced navel but being in a dark,warm,moist area also provide a favorable environment for microorganism like bacteria,fungi and resulting symptoms [foul smell, itching,
redness,pain] develop as secondary infection due to scratching
2. associated factors like being
overweight,
diabetes,overexposure to sun are also risk factors of getting the same.
3. Since there is foul smell coming out from navel you should see your doctor immediately to prevent a simple and treatable situation becoming major problem
4. Do not use over the counter creams/powder as they will only further irritate the area or aggravate the problem instead go for prescription
ointments and make sure to take the entire course of antibiotics/ antimicrobials if recommended by your doctor to make sure there won’t be a recurrence, till then clean the area with saline solution,tea tree oil,
hydrogen peroxide or alcohol to reduce navel infection