If you have soreness under your buttocks and on the back of your thighs, you can apply the following treatments: 1. You can apply topical creams for external application. You can apply pain-relieving and anti-inflammatory drugs for external application, such as Fotarin ointment or Yunnan Baiyao spray or safflower oil spray, all of which can relieve soreness under your buttocks and on the back of your thighs. 2. You can also take non-steroidal anti-inflammatory drugs, such as acetaminophen, compound 3, you can apply topical and physiotherapy methods, you can apply hot towels for local heat and topical application, which can relieve muscle pain caused by lactic acid accumulation and rhabdomyolysis. 4, finally, you can go to the hospital to perform microwave therapy method, you can use ultra-short wave physiotherapy instrument and microwave plasma The treatment can relieve the local soreness and pain.