The lesion of right pneumonitis refers to the pathological changes of degeneration, exudation and hyperplasia of lung tissues after the right lung is infected by pathogens such as bacteria and viruses. 1. Metamorphosis: metamorphosis is the change of degeneration and necrosis of local tissue cells after inflammatory injury. Such as cellular edema degeneration, cellular neutrophils release lysis itself, resulting in cell necrosis; interstitial cell necrosis can be seen as fibrinoid necrosis and mucus-like degeneration. 2. Exudation: Exudation refers to the process by which inflammatory cells, cellulose, proteins, etc. enter the tissue through blood vessels. Exudate can neutralize toxic substances, inflammatory cells can phagocytosis and destruction of bacteria, reduce infection, cellulose can limit the spread of pathogens and is conducive to tissue repair. 3. Proliferation: at the late stage of inflammatory lesion development, the parenchymal cells of local tissues can grow and differentiate to repair the damage; mesenchymal cells, such as fibroblasts, phagocytes, etc., can also proliferate to promote tissue recovery. The above three processes can occur in a certain sequence or separately. Don’t worry too much if you find the right pneumonic lesion, we suggest you to improve the lung CT, bronchoscopy and other related examinations and treat it according to the doctor’s instructions, in order to restore your health as soon as possible.