Deodorant armpit rash can occur for many reasons. Some people are allergic to deodorants, particularly the aluminum that can be in deodorants.
Visitation: It is estimated that the Town of Mammoth Lakes receives 1.3 million visitors in the winter and 1.5 million in the summer for an annual average of 2.8 million visits (May 2003).
1 In 2015, park visitation topped the 4 million. More than one-fourth of the parkâs total annual visitation was recorded during the month of July.  The last time the park recorded fewer than 3 million annual recreational visits was in 2006, with 2.87 million visits.