\documentclass[tikz]{standalone}

\usetikzlibrary{decorations.pathreplacing,decorations.markings}
\usetikzlibrary{patterns}

\begin{document}

\begin{tikzpicture}
%internal arcs
\draw[red] (0,0) to node[midway,left,scale=0.5]{\color{black} $1$} (-0.3,0.65);
\draw[blue] (0,0) to node[midway,right,scale=0.5]{\color{black} $2$} (0.3,0.65);

%external arc
\draw[looseness=1.75,out=0,in=0] (0,0) to (0,1.1);
\draw[looseness=1.75,out=180,in=180] (0,1.1) to (0,0);

%draws vertices
\draw[fill=black] (0,0) circle [radius=2pt];
\draw[thick] (-0.3,0.65) node {$\mathbf{\times}$};
\draw[thick] (0.3,0.65) node {$\mathbf{\times}$};

%exterior label
\node [above,scale=0.5,yshift=-2pt] at (0,1.1) {$a$};

\end{tikzpicture}

\end{document}