Hello,
It can be due to cystic
acne. Cystic
acne is the most severe form of
acne. Cystic
acne affects deeper skin tissue than the more superficial inflammation from common acne. Since they are severe, so systemic medications are usually required. The treatment consists of topical and oral antibiotics, tretinoin, oral contraceptives in females and Intralesional corticosteroid injections. Very severe cases may need excision and drainage.