Reference for Bekhorot 68:25

אם תימצי לומר

For we learnt: In the case of a bridegroom on whom there appears a plague spot, we give him seven days [of the wedding week not to see the priest] - to him, to his garment and to his covering.<span class="x" onmousemove="('comment',' Should a plague appear on it.');">¹²</span>

Jastrow