Cystic acne is one of the more serious types of acne. For cystic acne, the following methods are mainly used: the first, mainly oral retinoid drugs, such as isotretinoin gel pills, or oral vitamin capsules, these two drugs can choose one of them, especially with isotretinoin gel pills, but must be taken under normal liver function. The second, can be combined with anti-inflammatory drugs, such as roxithromycin, azithromycin, doxycycline, minocycline, etc., but be careful not to take doxycycline or minocycline and isotretinoin pills at the same time, there is a risk of causing pseudotumor-like reactions. The third, can be treated with photodynamic methods, for cystic acne has a very good treatment effect, it is recommended to treat under the guidance of professional dermatologists in regular hospitals.