Thanks for writing to us.
From the description it seems you might be having cystic acne
This type of acne is severe in grade and requires a course of oral isotretinoin
apart from antibiotics and topical anti acne creams. Too big lesions can also be treated by intralesional injection of steroid antibiotic combination( like tricort with lincomycin
You can also upload your image of concerned area and use ask a specialist service of this site for a detailed personalised treatment or can consult a dermatologist
near by for the same.
Hope that helps.
Dr Kalpana Pathak