You have aggravated the primary condition by applying black pepper.
Most probably black pepper has shown its irritant action.
You can start taking oral analgesics and oral antibiotic like Amoxycillin
Clean the area with plain water and apply some plain topical antibiotic
cream. Do not use dettol or any other soap or harsh chemical.
Visit a dermatologist
as soon as possible.
Dr. Ajit Singh Kulhari
MD - Skin & VD