Ubiquitous lumps on the legs but no pain may be caused by trauma, anaphylactic purpura, thrombocytopenic purpura and other diseases. 1. Trauma: When the skin of the leg collides, it will lead to the rupture of subcutaneous blood vessels, and when the blood in the vessels leaks out into the subcutaneous tissues, the patient may have ebony lumps and will not feel pain when no longer touched. 2. Anaphylactic purpura: Anaphylactic purpura is mainly caused by infection, immune disorder, heredity, drugs and other factors. Patients can have different degrees of purpura, mostly located in the limbs and buttocks, the initial stage can be purple-red papules, not accompanied by pain, after a few days can be changed to dark purple, and ultimately brown and subside, manifested in the legs with ubiquitous green lumps, but no pain. 3. Thrombocytopenic Purpura: The etiology of Thrombocytopenic Purpura is related to immunity, heredity, primary diseases and other factors. It is mainly manifested as petechiae and ecchymosis of the skin, and the patients may have bruises on the legs without pain. There are many reasons for the presence of erythematous masses on the legs without pain, and patients are advised to go to regular hospitals to find out the causes of the disease.