 [ 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 ] i am sorry to hear you are going through this gastroenteritis is no fun of course i am obligated to tell you that smoking marijuana is illegal except in states that allow medical marijuana usage and then only with a valid prescription so i can not really comment on the effect of marijuana on symptoms of gastroenteritis other than to say the medical community really does not know the effect of marijuana on many conditions because the substance has not been studied all that much as to your gastroenteritis you need to be aware it is contagious if you work in a food handling environment for example you should not return to work if necessary have your manager speak to your doctor to explain why it is a bad idea for you to return to work until your gastroenteritis has completely cleared up if you insist on going back to work it is imperative you wash your hands frequently with warm soapy water do not share eating utensils towels or other objects with co workers disinfect all food preparation areas and surfaces you touch frequently it would be a good idea for you to inform your co workers about the gastroenteritis so they can join with you in washing their hands frequently in order to avoid transmitting this illness among the staff and customers i hope you feel better soon