 [ Symptoms ] i have or think i have colorectal cancer metastatic or recurrent when should i contact my doctor [ Disease ] typical hsp rash in legs joint pain kidney affection u need ti do kidney follow up and monitor the kidneys v closely most of the time it resolves alone within feww weeks with recurrence rate wuthin the same period mostly no ttt needed but u may need pain killers angiinflammatory drugs upto steroids if needed consult an immunologist