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Your description seems to indicate an umbilical granuloma
. Umbilical granuloma forms as a result of improper healing or minor infection during healing of the cord. By using silver nitrate
sticks we basically try to destroy the unhealthy tissue in that region. Usually silver nitrate may be required to be repeated, as single application may not be sufficient. But if your son does respond then it would be great. But some discharge may persist even after application and repeat use may be required. You will know if its infected in case the discharge becomes thick and foul smelling, the region becomes red and your son cries on touch and if he develops fever
. Hope it does not happen.
However there are certain other things which may cause such a red spot in the belly button. Sometimes it may be communication with the intestine (partial or complete) or with the urinary bladder
. If the discharge persists, is foul smelling or looks like stool, then immediately consult a pediatric surgeon. It is important because these conditions (patent vitello intestinal duct: with intestine and patent urachus: with bladder) require surgical correction.
Hope that solves your query.
God bless you