Analysis needs to be based on the specific cause, which is generally related to a variety of factors such as etiology, physical condition, degree of illness, treatment, and post-treatment care. For example.
allergic purpura, which gradually disappears in about 10 days after hormonal treatment, but often recurs and the whole course of the disease can reach several months or even 1 to 2 years.
thrombocytopenic purpura, which is due to a reduction in platelets, is treated aggressively and disappears in about 2 weeks in most patients after platelets are elevated
For simple purpura, it disappears in about 1 week.