Hello Thanks for your query.Based on your description it appears to me that though you been circumcised it may be half way done still covering part of your glans penis
.The problem that you are facing is most likely to be due to what is called as Paraphimosis
This can be confirmed only on clinical examination So please consult some Urologist
for evaluation.You may need to undergo revision of circumcision
. As regards you having multiple bumps they are most likely sebaceous cysts .Normally they subside of their own and do not not need any treatment unless get infected or increase in size.