Hello and welcome,
The swelling may have occurred due to excessive handling or trauma from sex. Just bath it with warm water containing few drops of antiseptic and pat dry.
avoid handling it and sex till it gets healed.
If there is severe pain
or discharge you may need to see a doctor.
Use of neosporin
powder twice locally by light dusting and acetaminophen
tablets [ tylenol] once a day with milk will help to reduce mild pain and promote early healing.
Hope this satisfies your query.
Feel free to ask any more questions that you may have.
Dr Madhuri Bagde
Consultant Obstetrician and Gynecologist