Ultimate Spider-Man, Vol. 1 #44 (2003)

Tampered
Peter wakes up with the X-Men, and accidentally reveals his secret identity when he notices they removed his mask. He puts it back on before they go see Geldoff, who is not a mutant, but the result of illegal experimentation on the placenta back in his home Latveria. When Peter gets home, a very upset Aunt May is waiting for him.
Release Date: 2003