Topical treatment of recurrent herpes simplex and post-herpetic erythema multiforme with low concentrations of zinc sulphate solution.

The preventive effect of low concentrations of zinc sulphate solution in recurrent herpes simplex of the skin and oral mucous membrane is reported. Treatment with zinc sulphate solution of the skin at the site of the herpetic infection also prevents relapse of post-herpetic erythema multiforme. For the skin, 0.025-0.05%, and for the oral mucous membrane, 0.01-0.025% zinc sulphate solution was used.