Hard lumps growing on the buttocks hurt when pressed may be the manifestation of gluteal myofasciitis, and may also be the symptoms of sciatic tuberosity bursitis and other diseases, which need to be analyzed specifically. 1. gluteal myofasciitis: this disease is common in long-term sedentary or stooping laborious people, the pain mainly appears in the upper part of the buttocks close to the iliac crest, when pressing the lump area, you will feel the pressure pain. The pain will be effectively relieved after sufficient rest, hot compress, massage and other measures. 2. Sciatic node bursitis: pain will appear in the area where the buttocks and chair are in contact after sitting for a long time, and hard lumps may be felt when pressing the deep part with the hand, which is one of the common buttock pain disorders and needs to be closed for treatment. Hard lumps on the buttocks pain when pressed may also be sebaceous cysts, lipomas, fibroids and other diseases, it is recommended that patients go to the hospital in time to do the relevant examination, for the results of the examination to do the treatment.