Ingrown Hair Cysts Treatments Causes Symptoms Nodule caused by an ingrown trichome may be an uncomfortable condition which needs correct treatment. Such type of lump arises when a hair becomes in within your epidermis, triggering inflammation and potential infection. Treating a cyst caused by an hair effectively could help alleviate pain and avoid more issues. If you're having difficulties with a cyst, visiting medical guidance is advisable to address it properly and avoid any potential dangers associated with DIY approaches.