Ingrown Pubic Hair Causes Treatment and Prevention FloNodule resulting from an ingrown strand may be a painful issue which demands adequate treatment. Such form of cyst develops when an ingrown hair grows back into your epidermis, resulting in irritation and possible infection. Managing a cyst resulting from an ingrown hair effectively may help relieve unease and avoid further issues. Should you be struggling with an ingrown hair cyst, visiting professional recommendations is advisable to treat it properly and prevent any potential hazards hinged on DIY approaches.