There are pits on the buttocks that may belong to people with well-developed buttocks muscles, because some people who specialize in exercising the buttocks, or people who do fitness exercises for the lower limbs and athletes who do strenuous sports for the lower limbs, have better muscle lines in the buttocks, so it can be seen that there are depressions on the back and outside of the buttocks, but such depressions are more symmetrical on both sides and are normal. However, if there is a depression on one side of the hip, then we must suspect that it is a disease problem, the most common one is hip muscle atrophy, for example, some lumbar diseases compress the nerves of the hip, sometimes lumbar disc herniation, spinal stenosis or vertebral slippage compress the nerve roots of the hip, which leads to long-term hip muscle lesions or atrophy without force. In addition, this symptom can also occur when the lower limbs are unable to move with force for a long time due to femoral head necrosis.