A search for the doubly charged Higgs boson in $pp$ collisions at $\sqrt{s}=7$\TeV is presented. The data correspond to an integrated luminosity of \lumitot collected by the CMS experiment at the LHC. The doubly charged Higgs is a member of $SU(2)_L$ scalar triplet $\Phi$ in extensions of the Standard Model which include the seesaw mechanism of type II. The search is inclusive and is performed in events with three or more isolated charged leptons of all flavors originating from the decays of pair produced triplet components $\Phi^{++}\Phi^{--}$ and $\Phi^{++}\Phi^{-}.$ No signal is observed and new lower limits at the 95\% confidence level are set on the $\Phi^{\pm\pm}$ mass, under specific assumption on the \dblh branching fraction. Upper bounds of \mmres\GeV in the $\mu\mu$ channel, of \emres\GeV in e$\mu$ channel, of \eeres\GeV in the $ee$ channel, of \mtres\GeV in the $\mu\tau$ channel, of \etres\GeV in the e$\tau$ channel, of \ttres\GeV in the $\tau\tau$ channel and between \bponeres\GeV and \bptwores\GeV in four chosen benchmark points are set for the type-II see-saw model.

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