<s>[INST] I just finished chemo & radiation for anal cancer. I had a tumor around my anus, stage 2 that was first surgically removed along with hemorroids. within the first month after treatment, I have a soft lump from front of anus towards my vagina. it is very painful to touch. what could it be? [/INST] Hello.... You have got surgery and chemo radiation for your anal cancer...ND as u have lump near UT anal canal may be due to some cause.... as it is painful its more likely to be infectious... Becoz chemo and radiation also lowers the immunity of body... Better to confirm and rule out new malignancy primarily a sonographic scan would be a better option...along with routine blood investigation... That will lead us to a proper diagnosis and treatment </s>