Antigen
The antibiotic penicillin is a small molecule that does not induce antibody formation. However, penicillin binds to serum proteins and forms a complex that in some people induces antibody formation resulting in an allergic reaction. Penicillin is therefore

an antigen
an immunogen
a hapten
both an antigen and a hapten

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Antigen
During the lag period between antigen contact and detection of adaptive immunity,

innate immunity blocks the activation of adaptive immune effector cells
new B and T cells with the appropriate antigen specificity must be produced in the bone marrow
antigen is hidden from the immune system in macrophages
innate immune effectors are eliminating antigen

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