Sub Articulo 101.0

Every now then I have these long displayed equations 
and I manage to fit them on a single line by using 
a small font. 
ie 
\begin{small} 
 \begin{equation*}
  Long = equation 
 \end{equation*}
\end{small} 
 
When I do this, the text following the equation 
has a tiny indentation, not a paragraph indentation 
as I dont leave a blank line. 
Has anybody noticed this? 
Is there any fix for this?