Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns.
As per your complain smelly discharge from belly button can be due to infection and
abscess formation in the belly button and it leads to pus formation..
The
stretch marks can be due to expansion of the abdomen and as you have no periods for 4 months you should consult a Gynaecologist and get evaluated for conditions like Polycystic ovary disease,
hormonal imbalances etc..
The infection does not seems to be due to it but can be due to poor hygiene and accumulation of moisture and bacteria in the belly button causing infection..
You can take a short antibiotic course like
Augmentin, take a sterile piece of gauze and drain out pus with putting gentle pressure over the area..
You can apply antiseptic solution to clean the area and apply
triple antibiotic ointment on it..
Keep the area dry and clean..
In case if it still does not improve consult a physician and get evaluated..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora