There may be two reasons for this phenomenon, the most common is that people with more developed muscles, people who often exercise muscle cells are often in a relatively tense state, the location of the muscles that appear granular feeling is generally the location of the more abundant human muscles, such as the muscle groups of the thighs, shoulder joints, pectoralis major, the muscles of the buttocks, etc.. If you often carry out physical exercise, strength training, usually no discomfort, muscle granularity is a normal phenomenon. There is also a situation where the local muscles have impaired blood circulation or chronic inflammation, causing pathological muscle spasms, resulting in local muscle granulation, this cause of muscle granulation is generally accompanied by muscle soreness, pain, the appearance of this feeling should be timely symptomatic treatment.