Hello. Thank you for contacting HCM. From the description that you are giving that hole appears to be Pilonidal Sinus. Sinus is simply a channel or cavity. Pilonidal Sinus may not cause any noticeable symptom unless it becomes infected. To avoid infection I would suggest you regularly shave that area, wear loose clothing to avoid any friction and maintain very good hygiene. In case of infection which presents itself as painful lump, pus or blood discharge, I would recommend you consult your local physician for clinical evaluation and further management accordingly. I hope this answers your question. Please feel free to contact HCM again if you have any concerns. Wishing you good health.