Nodular acne is a slightly more severe type of acne that manifests clinically as nodules of varying sizes. Treatment is slightly more difficult than ordinary acne, and can cause scarring if not treated properly or repeatedly stimulated. The main treatments for nodular acne are as follows: 1. For solitary nodular acne, if scars are formed the most effective treatment can be local closure, which is to send drugs to the nodular acne site to promote is nodular softening and nodular absorption. 2. Multiple nodular acne can be treated with physical therapy, such as red and blue light irradiation can sterilize the skin surface, and those with conditions can also be treated with light 3. For nodular acne with inflammation, oral tetracycline therapy, such as doxycycline, can be used. 4. Oral retinoic acid drugs, such as isotretinoin soft capsules, are more effective for nodular and cystic acne.