hi Seems like you have developed a lesion of acne cystica...ie cystic lesion of acne.. Cystic acne, or nodulocystic acne, is the most severe form of acne vulgaris. Deep, inflamed breakouts develop on the face and/or other areas of the body. The blemishes themselves can become large; some may measure up to several centimeters across. Nodulocystic acne sufferers develop nodules as well as cysts. Nodules are hard, painful lumps under the skin s surface. Much larger than papules, nodules form deep within the skin and take a long time to heal. Systemic medications are usually required. Acne of this severity can be hard to control. It may take several tries to find the treatment or combination of treatments that work for you. Some common treatments for nodulocystic acne include: oral antibiotics isotretinoin intralesional corticosteroid injections Cryotherapy So i would advise you to visit a dermatologist and get the best possible treatment done,,, Hope it helps Dr Geetika Paul