Thanks for all these additional information.
I understand your concern.
Well as you describe and picture suggests sebaceous cyst/abscess formation.
Clean the area with betadine solution.
You should apply OTC 1% hydrocortisone cream mixed with bacitracin ointment.
Also use abzorb powder after bath.
You should take OTC Claritin and Motrin for 5-7 days.
If your symptoms'll not improve or pus discharge from it then see your doctor for a clinical examination for further evaluation and management.
Antibiotics and steroids can be prescribed.
Eat fibre rich diet and hydrate yourself with plenty of fluids to prevent constipation.
Avoid sitting for prolonged hours.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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