Suggest Treatment For Swollen And Painful Buttocks

I have developed pain and tenderness in my lower right butt cheek at the top of my thigh. It appears to be slightly puffy or swollen. No redness or warmth. No injuries and have not exercised for over a week. Tylenol appears to help temporarily. Not severe but nagging pain. I am a 58 year old female in good health, not overweight. Exercise regularly. Don't smoke or drink.