Benadryl lotion and scar gel works well. It can be applied as soon as you see a bite, with benadryl lotion first and then scar gel rubbed in over it.
The ingredients for the Benadryl lotion are diphenhydramine hydrochloride 2% and zinc acetate 0.1%. You can buy a generic brand’s version with the same ingredients at a lower price.
The scar gel that works well is manufactured by Product Quest Manufacturing and available at Good Neighbor Pharmacy stores. It is called Scar Gel. The ingredients are Water , Glyceryl Polymethacrylate , Propylene , Glycol , Allium Cepa (Red Onion) Bulb Extract , Polysorbate 20 , Phenoxyethanoland Chlorphenesin, Glycerin, Methylparaben, Benzoic Acid , Sodium Carbomer , Aloe Vera (Aloe Barbadensis) Gel , Juglans Regia (Walnut) Shell Extract , Allantoin , Chamomilla (Anthemis Nobilis) Flower Extract , Disodium EDTA , Fragrance , Phytonadione (Vitamin K1)