ST. LOUIS, July 18 Mosquito bites may seem a part of summer, but if a person gets an insect bite, a U.S. expert advises using roll-on antiperspirant.
[snip]
".. if you... get an itchy welt, dab a bit of roll-on antiperspirant directly on the bug bite and the itching will stop," Haller said in a statement.
"The aluminum salts in the antiperspirant help the body to reabsorb the fluid in the bug bite. The swelling goes down and the itching goes away."

Okay, then. I was concerned it might be because the antiperspirant was made in China and bugs just died from being in your vicinity....