Is A Bump Underneath The Amputated Leg A Serious Concern?
I can understand your concern ,a small bump may be an allergic rash. is it itching? any fever or redness anywhere? anywhere else rash is there? if it is itching then its allergic only. if that is cystic fluid collection or something it needs to he excised.
If you can upload a photo of it, I will be better able to help. Just don't worry about the bump. hope you get back to us with photo and any other relevant history for follow up.
Hope this info helps you sort out your problems and if you feel its helpful kindly give me user thank vote happy health!