Demulcent herbs will soothe the mucous linings and ease discomfort.
Anti-inflammatories will reduce the immediate cause of the distress.
Anti-microbial herbs are indicated if there is a causal microorganism involved. However they are not indicated if the inflammation is due to some other cause.
Astringents are often effective as a local gargle, especially when the problem has been precipitated by overuse of the vocal cords..
Bitters have a toning and stimulating effect upon the mucosal lining of the area.

Salvia officinalis var. rubia (Red sage)
Potentilla tormentosa (Tormentil)
Achillea millefolium (Yarrow)
Geranium maculatum (American Cranesbill)
Quercus spp. (Oak Bark)
Rubus villosus (Blackberry leaves)
Rubus idaeus (Raspberry leaves)
Sambucus nigra (Elderflowers)
Polygonum bistortum (Bistort root)

Echinacea spp. --- --- --- 2 parts
Ligusticum porterii --- --- --- 2 parts
Hydrastis canadensis --- --- --- 1 part to 1ml. tincture every hour

Salvia officinalis var. rubia
Matricaria officinalis --- --- --- equal parts of herb and gargle with a strong infusion often until symptoms subside.

Malva neglecta or Malva sylvestris

infuse flowers and leaves in lukewarm water overnight, ensuring the best extraction of mucilage. Gargle as needed.