Hi, I have a hard lump on right side next to tailbone and started feeling pain Mon. afternoon. My tailbone was painful but been taking tylenol and the pain is more dull. I still can t sit back or lay on my back. I only remember sitting in a car for 2 hours on a day vacation this Sat., slept on a hard mattress Fri. evening, and bumped my bottom when making the bed Friday evening.
Hi there. Thanks for your question at Chat Doctor.  New lump needs to be seen by a doctor. If this lump is something you have noticed now only, it is best that you see a doctor and get it examined. Tail bone pain responds best to offloading the pressure over it. Sitting cushion which is usually a horse show shaped, or a doughnut shaped inflatable balloon cushion helps to offload pressure on tail bone. I suggest you to use it religiously irrespective of where you are sitting over at least 6 weeks to get any meaningful benefit from it. Also, it is advisable to avoid sleeping directly over your back. Sleeping on the sides for a few weeks can help. Relieving the pressure over the tail bone is the most important step in relieving your pain. You can use any painkiller over initial few days. The lump is mostly the tip of tail bone.  Hope this helps.  All the best Regards.