Thanks for your query and a clear picture / photograph.
This shows clearly that it is a small boil or an infected cyst, on the way to rupture.
You can apply Liquid Povidone Iodine and pop it.
This may resolve on its own.
You may take Ibuprofen if there is a pain.
If this does not resolve withing a day consult a Doctor for proper treatment.
I hope this answer helps you.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.