It seems that you might be having chronic fungal infection
having chronic bacterial infection.
Due to itching bacterial infection takes place resulting bumps and pus formation.
Apply triple acting cream locally.
Go for one course of antibiotic medicine after consulting your doctor.
Take oral anti-fungal tablet like Flucanozole 150 mg once in a weekfor 4 weeks.
Kepp local hygiene clean, dry and airy.
Ok and take care.