Ointment designed to treat coldsores Apply to affected area Contains Lysine Lysine is an essential amino acid. This lysine ointment has been especially designed for the treatment of coldsores and dry lips and may help with the symptomatic relief. Ointment designed to treat coldsores Apply to affected area Contains Lysine Lysine is an essential amino acid. This lysine ointment has been especially designed for the treatment of coldsores and dry lips and may help with the symptomatic relief.