Im not to familiar with coins but have become interested i have many cents but not shure if im saving the correct ones any way here I have a 1994 penny with error you can even see an eye ball on Lincoln hair tell me what you think
More likely a plating blister which would not make it an error. This is after all a zinc based cent with 8 micron copper plating. Note the other blister at the chin and the zinc rot at the date and mint mark.
On the date, it is called split plating which is not an error, just the plating was stretched to thin at that particular area. The area around the mint mark is beginning to rot at this area exposing the underlying zinc. The letters that I can see in your photo also appear to have plating issues. Once the copper plating bubbles it can cause the zinc to interact with the environment and zinc starts to bubble out of these areas making it look like all sorts of things, like doubled lettering and numerals.
Thank you Like i mentioned i k ow nothing is why im asking Never would of thought all that Thank you im on the road to learning again thanks for ur time and reply