 [ Symptoms ] can i use calamine lotion on a sympton like heat rash  i have had a shaved head for over 20 years and decided to shave my head against the grain use bump patrol afterwards as i normally do no problem until the next day i developed what looks like heat rash as i work outside daily but i also wear a hat never had ingrown hair problems [ Disease ] calamine may help but shaving against the grain may have resulted in a condition called folliculitis    a skin infection that involves the hair follicles an antibacterial cream may be preferable