"Mild spiciness" means that something has a slight amount of spiciness or heat, but it is not very strong or intense.
Sentences with «mild spiciness»
It was refreshing, sweet with a touch of mild spiciness. (natalieshealth.com)
The chive pesto and arugula add a nice mild spiciness, the cucumber gives it... (cali-zona.com)
With the remaining adzuki beans, Gary made this Red Enchilada Sauce Soup which felt especially good with the mild spiciness to help clear our clogged sinuses. (responsibleeatingandliving.com)