Unclean bellybuttons can lead to cysts erupting.
Unclean bellybutton cysts
Bacteria from sweat, dead skin or dirt can be left to grow in the folds of skin and if personal hygiene isn't good, an unpleasant smell can turn into a combination of redness, itching and swelling.
According to experts, the best way to avoid this condition - also known as candida - is to wash and dry the bellybutton area daily.
Candida is also found in the armpits, groin or the bellybutton and left untreated erupting cysts, blisters and pus will form.
Anyone with bellybutton piercings or are overweight are at an increased risk of getting the infection as the area is harder to clean, according to The Sun Online.