is this normal for 50 mW laser?

hi guys i bought a 50 mW and its amazing but ive notices this ring i think its normal but im not sure. please let me know and thanks a lot! i hope you can tell from the pic.

That looks like a dirty lens to me. Try blowing it off with compressed air first. If that doesn't work, use 91% isopropyl alcohol (available at most pharmacies) and a q-tip. Moisten the q-tip with alcohol, and GENTLY wipe the lens down. After the remaining alcohol evaporates, you should notice an improvement.

is it a cheap green? if so all of mine have done this and they were from different places and different powers.. i think its normal if its a cheapy.. cuz i also tryed cleaning the lens and blowing it off but nothing worked.. and its gotten worse.. so yeah.. my $0.02