Thanks for your query
Looks like you have developed a sebaceous cyst
Do not touch it much as it can cause more irritation.
Mostly it can be left if there are on symptoms.
Since it is causing irritation in your case, you might need to go for surgical excision.
In addition, a short course of oral antibiotics
may be needed as well.
I would advise you to see a nearby dermatologist
or a physician for further management.
Hope it helps
Dr Geetika Paul